GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » GMC » GMCnet » PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: (It's been a very VERY long haul, a wheel barrow of money and lots of frustration)
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325226 is a reply to message #325172] Fri, 20 October 2017 19:38 Go to previous messageGo to next message
Steve is currently offline  Steve   United States
Messages: 481
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
Senior Member
I had intermittent power issues last year that I could not figure out. I tried everything fuel and ignition with no results. In a desperate attempt I removed the carburetor and took it to Ken Fry for a cleaning. I watched as he disassembled, cleaned and checked. Everything seemed ok. When I reinstalled the carb it ran perfectly and I have not had any issues since. I also replaced the carb to intake mani fold gasket. I don't know if it was the gasket or something a miss in the carb. Just happy to have solved the problem.

1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325233 is a reply to message #325172] Fri, 20 October 2017 23:06 Go to previous messageGo to next message
kerry pinkerton is currently offline  kerry pinkerton   United States
Messages: 2527
Registered: July 2012
Location: Harvest, Al
Karma: 19
Senior Member
Chuck Boyd is dead nuts right. I'm embarrassed, it didn't cross my mind...some mechanic I am.... Embarassed

Make sure your tank is venting. A plugged vent will give you that exact problem. That is, runs fine for a while and then just acts like it's not getting gas, bucks, won't go...Let it sit a while and it will run fine for a while...


Kerry Pinkerton - North Alabama Had 5 over the years. Still have the first a 76 that will be rebodied into an art deco car hauler. http://www.bdub.net/pinkerton/ '03 Fleetwood Discovery 39L
Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325236 is a reply to message #325233] Fri, 20 October 2017 23:37 Go to previous messageGo to next message
Dave Stragand is currently offline  Dave Stragand   United States
Messages: 26
Registered: October 2017
Karma: 0
Junior Member
If you’re changing the lines, it can’t hurt to look at the fuel sock on the pickup. Rust in the tank can accumulate on the sock as you drive, building up even to the point of a stall. Once the suction stops, the rust flakes fall off and all seems just fine again for a while.

I usually put a couple of strong magnets on the bottom of our old cars’ tanks, but out of the path of the float arm. It helps keep the rust away from the pickup.

On one particularly rusty tank, we removed the sock and installed a transparent glass filter in the fuel line close to the tank. It was easy to spot and clean the accumulated rust out before it could continue to cause problems.

There is an old-school tank rust removal of adding a gallon of acetone and a length or two of chain, then agitating it for a while. It won’t make it shiny and new, but it does remove the loose rust scale.

Some things to consider if you end up dropping the tanks.

-Dave

> On Oct 21, 2017, at 12:07 AM, Kerry Pinkerton wrote:
>
> Chuck Boyd is dead nuts right. I'm embarrassed, it didn't cross my mind...some mechanic I am.... :blush:
>
> Make sure your tank is venting. A plugged vent will give you that exact problem. That is, runs fine for a while and then just acts like it's not
> getting gas, bucks, won't go...Let it sit a while and it will run fine for a while...
> --
> Kerry Pinkerton - North Alabama
>
> Had 5 over the years. Still have the first a 76 that will be rebodied into an art deco car hauler.
>
> http://www.bdub.net/pinkerton/
>
> '03 Fleetwood Discovery 39L
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org


1978 Transmode (403) Pittsburgh, PA
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325238 is a reply to message #325233] Sat, 21 October 2017 02:35 Go to previous messageGo to next message
GatsbysCruise is currently offline  GatsbysCruise   United States
Messages: 31
Registered: January 2017
Location: Waukegan, Illinois
Karma: 0
Member
kerry pinkerton wrote on Fri, 20 October 2017 23:06
Chuck Boyd is dead nuts right. I'm embarrassed, it didn't cross my mind...some mechanic I am.... Embarassed

Make sure your tank is venting. A plugged vent will give you that exact problem. That is, runs fine for a while and then just acts like it's not getting gas, bucks, won't go...Let it sit a while and it will run fine for a while...


******

Venting has never been a problem. The PO has this crapola locking cap that does not lock, it just rattles and can be taken off with no problem.
The early problem was sort of opposite of what you are saying.
I'd get gas, then take off. I'd have a speed cap, usually about 60 or less and I'd have to pull over for about 30 minutes. When I got back on the road, it ran find until I filled up again.

Obviously, the scenario has changed, probably with the changing of different components as we found bad ones.

NOW, when I had the external gas tank connected to the engine mechanical fuel pump, I could run down the road 75 with no problem.
BUT connected to the GMC gas tanks, its different...

When on the main tank, with no electric pump assist, the float bowl will go empty and the engine stalls.
How do I know the bowl is empty? when I turn on the electric fuel pump to purge the gas line and carb, I can hear the gurgling of the gas filling the bowl.

When on the RESERVE tank, which uses the electric fuel pump, I can get up to 55 mph before the power problems begin...

Everything is new, hose, from the front to the back to, and including, the fuel solenoid valve.

I'm sure someone might recognise these symptoms, but they are different depending on the source tank.

I'm just glad I can drive her again, FINALLY!
slc


GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center in Waukegan

[Updated on: Sat, 21 October 2017 02:39]

Report message to a moderator

Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325239 is a reply to message #325238] Sat, 21 October 2017 04:16 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15496
Registered: July 2007
Location: Sydney, Australia
Karma: 42
Senior Member
G'day,

I'd suggest you install a metal filter as per this photo:

http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p54750-fuel-pump-inlet-filter.html

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808



_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org



Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325248 is a reply to message #325219] Sat, 21 October 2017 08:50 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
Messages: 6465
Registered: March 2007
Location: S.E. Michigan
Karma: 32
Senior Member
GatsbysCruise wrote on Fri, 20 October 2017 18:42
johnd01 wrote on Fri, 20 October 2017 12:50
Are auto parts stores selling gas lines that are not compatible with
today's fuels?
How often do the fuel lines need to be changed?


*****
I can answer this one.
in 2007 they did have a hose that resisted the ethanol, but not a lot of people were aware of the problems until your hose rotted away. Seems to me it took a few years to do it.

I am told that the hoses today are pretty much some degree of ethanol protected, but you still have to check as counter people at some establishments don't think about it and could sell you some of the old hose with no protection.
Some folks have tried to circumvent the problem by putting in entirely metal fuel lines.

I seem to think if you just put metal line where you cannot access it, such as above the tanks, and have hose were you can get at it, changing the fuel line would not be that big of a problem. Just my thoughts on that one.

slc

It seems I have an answer for both of you.

Yes, parts stores ARE SELLING hose as fuel line that is not alcohol resistant in the long term. They may say it is, but that means that it will outlast the warranty. You have to check both the manufacturer and the hose specification if you don't want to do the job over in 5 years.

Matt


Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325249 is a reply to message #325172] Sat, 21 October 2017 09:27 Go to previous messageGo to next message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 1438
Registered: June 2008
Location: S. Ontario, Canada
Karma: 6
Senior Member
In 2010 while the GMC was on the hoist waiting for the engine to be rebuilt, I had the tanks dropped and all the fuel lines changed.

In 2014 while waiting to leave a rally I flipped the tank switch and a few moment later the coach stumbled, quit and would not restart. I had the laptop connected and noticed the EBL was reporting very little fuel pressure. Flipped the switch back to the original tank, fuel pressure was back and the coach restarted and drove home. Back home I dropped the tanks and found the fuel out line on the top of the tank had deteriorated, hard and cracked after only 4 years. The hose was SAE 30R7 with a date code of 2007.

I replaced all the hose with 30R9 hose and installed steel lines above the tanks.

This spring I took it for a short rustbuster run to town and proceeded to fill her with gas. Then I noticed gas dropping just ahead of the tanks. apparently I missed replacing a one foot piece between the selector valve and the fuel pump so on the suction side. It did not leak when the pump was running. This time it was SAE 30R14 low permeability hose they were stocking.

So it does not take long for non-ethanol rated hose to deteriorate.

I'd drop the tanks, check for rust inside and the condition of the socks. then replace the lines above the tanks too. Put new seals on the senders because the ethanol will eat that rubber too. Don't forget to replace the short filler hose pieces before they start leaking.


Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325255 is a reply to message #325249] Sat, 21 October 2017 12:09 Go to previous messageGo to next message
GatsbysCruise is currently offline  GatsbysCruise   United States
Messages: 31
Registered: January 2017
Location: Waukegan, Illinois
Karma: 0
Member
RF_Burns wrote on Sat, 21 October 2017 09:27
In 2010 while the GMC was on the hoist waiting for the engine to be rebuilt, I had the tanks dropped and all the fuel lines changed.

In 2014 while waiting to leave a rally I flipped the tank switch and a few moment later the coach stumbled, quit and would not restart. I had the laptop connected and noticed the EBL was reporting very little fuel pressure. Flipped the switch back to the original tank, fuel pressure was back and the coach restarted and drove home. Back home I dropped the tanks and found the fuel out line on the top of the tank had deteriorated, hard and cracked after only 4 years. The hose was SAE 30R7 with a date code of 2007.

When I had my hoses replaced in 2007, my hoses were in this sorry condition. I assume they were OEM

I replaced all the hose with 30R9 hose and installed steel lines above the tanks.

I would like to put the metal lines above the tanks. HOW DO YOU CONNECT/SEAL to the tanks?? If the tanks can be connected to metal lines permanently, the rubber hoses can much more easily be replaced when needed.

[b][color=red]/// CUT ///



GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center in Waukegan
[GMCnet] Metal lines for fuel [message #325256 is a reply to message #325255] Sat, 21 October 2017 12:33 Go to previous messageGo to next message
Emery Stora is currently offline  Emery Stora   United States
Messages: 675
Registered: January 2011
Karma: 1
Senior Member
>
> RF_Burns wrote on Sat, 21 October 2017 09:27
>> In 2010 while the GMC was on the hoist waiting for the engine to be rebuilt, I had the tanks dropped and all the fuel lines changed.
>>
>> In 2014 while waiting to leave a rally I flipped the tank switch and a few moment later the coach stumbled, quit and would not restart. I had the
>> laptop connected and noticed the EBL was reporting very little fuel pressure. Flipped the switch back to the original tank, fuel pressure was back
>> and the coach restarted and drove home. Back home I dropped the tanks and found the fuel out line on the top of the tank had deteriorated, hard and
>> cracked after only 4 years. The hose was SAE 30R7 with a date code of 2007.
>>
>> When I had my hoses replaced in 2007, my hoses were in this sorry condition. I assume they were OEM
>>
>> I replaced all the hose with 30R9 hose and installed steel lines above the tanks.
>>
>> I would like to put the metal lines above the tanks. HOW DO YOU CONNECT/SEAL to the tanks?? If the tanks can be connected to metal lines
>> permanently, the rubber hoses can much more easily be replaced when needed.

Connecting metal lines to the fuel tanks is not difficult.
Here is my presentation on installing in-tank fuel pumps. It shows how to cut the swedged end from the fuel pickup lines and the use of brass compression fittings to connect the metal lines to the cut ends of the pickup tubes..
Even if you are not putting in-tank fuel pumps into the tanks this is a good way to eliminate the rubber hoses. I installed metal lines all the way from the fuel tanks to the throttle body (TBI) or carb if that is what you are using.

http://www.gmcmi.com/wp-content/uploads/2013/02/In_tank_Fuel_Pump_Presentation.pdf


For the rubber vent lines I installed steel lines over the top of the fuel tanks and down to the sides of them. This would allow me to monitor the rubber vent lines and easily replace them if needed without dropping the tanks.

Contact me if you need more information of suggestions.

Emery Stora
77 Kingsley
Frederick, CO


_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325257 is a reply to message #325172] Sat, 21 October 2017 12:41 Go to previous messageGo to next message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 1438
Registered: June 2008
Location: S. Ontario, Canada
Karma: 6
Senior Member
I checked the sizes and measured how long I needed for each line, then I bought pre-cut lengths of the right size. I pre-bent the tubing then cut the flare off both the tank fitting and the tube. I used compression fittings to join them, I believe 3/8" compression fittings. I put a length of old hose over the tubing to prevent rattling against the tank and stuck them in place with gorilla tape. Search for Emery's Tech presentation (PDF at GMC Eastern States I believe) on in-tank fuel pumps for more info on attaching the compression fittings to the fuel tank tubes.
http://www.gmcmhphotos.com/photos/fuel-tank-lines/p61891-fuel-tank-lines.html

I had issues with gas smell after fillup and weeping fuel off the top of one tank. With a tiny bit of air pressure and some soap and water I found the vapour outlet was leaking. See the rest of my album about fixing that. I just replaced the rubbing tubing for that line rather than using steel.
http://www.gmcmhphotos.com/photos/g7006-fuel-tank-lines.html

If I recall back when the tanks were dropped in 2010, then socks had disintegrated so I replaced them at that time.





Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325258 is a reply to message #325172] Sat, 21 October 2017 12:44 Go to previous messageGo to next message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 1438
Registered: June 2008
Location: S. Ontario, Canada
Karma: 6
Senior Member
Emery beat me to it with the link.

Thanks for that write-up article Emery. Lots of good info even if not going to the in-tank pumps


Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
Re: [GMCnet] Metal lines for fuel [message #325262 is a reply to message #325256] Sat, 21 October 2017 14:13 Go to previous messageGo to next message
GatsbysCruise is currently offline  GatsbysCruise   United States
Messages: 31
Registered: January 2017
Location: Waukegan, Illinois
Karma: 0
Member
Emery Stora wrote on Sat, 21 October 2017 12:33


Connecting metal lines to the fuel tanks is not difficult.
Here is my presentation on installing in-tank fuel pumps. It shows how to cut the swedged end from the fuel pickup lines and the use of brass compression fittings to connect the metal lines to the cut ends of the pickup tubes..
Even if you are not putting in-tank fuel pumps into the tanks this is a good way to eliminate the rubber hoses. I installed metal lines all the way from the fuel tanks to the throttle body (TBI) or carb if that is what you are using.

http://www.gmcmi.com/wp-content/uploads/2013/02/In_tank_Fuel_Pump_Presentation.pdf


For the rubber vent lines I installed steel lines over the top of the fuel tanks and down to the sides of them. This would allow me to monitor the rubber vent lines and easily replace them if needed without dropping the tanks.

Contact me if you need more information of suggestions.

Emery Stora
77 Kingsley
Frederick, CO




*****

Thanks for the link
After looking at the top of the tank, it seems attaching metal lines is very doable.....

Anyone who is interested or even wonders what is above the tank should take a look...

thanks again

slc


GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center in Waukegan
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325332 is a reply to message #325233] Mon, 23 October 2017 13:38 Go to previous messageGo to next message
GatsbysCruise is currently offline  GatsbysCruise   United States
Messages: 31
Registered: January 2017
Location: Waukegan, Illinois
Karma: 0
Member
kerry pinkerton wrote on Fri, 20 October 2017 23:06
Chuck Boyd is dead nuts right. I'm embarrassed, it didn't cross my mind...some mechanic I am.... Embarassed

Make sure your tank is venting. A plugged vent will give you that exact problem. That is, runs fine for a while and then just acts like it's not getting gas, bucks, won't go...Let it sit a while and it will run fine for a while...


*****

Ok Kerry
This in some form, sounds similar. It struck me as I read this.

The original problem in 2007 was power loss at 60 and as I drove my top speed limit would slowly decrease, by the time I approached Illinois, top speed was under 40.
ALSO, when the tanks were dropped, the inside was inspected clean but it acted like the intake was being starved from dirt blocking or plugging the line.
I would stop at the gas station, fill up and take off. I would have the power loss. I would then pull over for about 30 minutes, head home and the power loss would almost be gone until I filled up with gas again.

That was then.

been through all those carborators, fuel pumps, replaced the manifold(had cracks) and now the source of the problem is down to fuel source/tanks.

on the main tank it is either an air leak or pinched line because it will run the fuel bowl down and stall the engine, not even on the road.
The RESERVE tank has an electric fuel pump at the fuel solenoid valve so fuel is pushed forward. But I think it might be starved ( pinched hose? ) because I can't get over 55mph...

Now remember, I had an external gas can feeding the engine mech fuel pump and was doing 75mph with NO PROBLEM....
All filters are clean, no dirt or residue.

The problem seems obvious, just a matter of getting some ramps built and dropping the tanks to see what really is wrong.



GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center in Waukegan
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325333 is a reply to message #325249] Mon, 23 October 2017 13:48 Go to previous messageGo to next message
GatsbysCruise is currently offline  GatsbysCruise   United States
Messages: 31
Registered: January 2017
Location: Waukegan, Illinois
Karma: 0
Member
RF_Burns wrote on Sat, 21 October 2017 09:27
In 2010 while the GMC was on the hoist waiting for the engine to be rebuilt, I had the tanks dropped and all the fuel lines changed.

X CUT X Back home I dropped the tanks and found the fuel out line on the top of the tank had deteriorated, hard and cracked after only 4 years. The hose was SAE 30R7 with a date code of 2007.

X CUT X
I'd drop the tanks, check for rust inside and the condition of the socks. then replace the lines above the tanks too. Put new seals on the senders because the ethanol will eat that rubber too. Don't forget to replace the short filler hose pieces before they start leaking.


******

Are the fuel pick up hoses inside the tanks rubber??? Is there a way to make them steel? How do you seal where the metal line comes through the tank?
With todays ethanol fuels, it seems silly not to use metal in the tank, doesn't it???

Thanks for your help.
slc
Gatsbys' Cruiser


GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center in Waukegan
Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325337 is a reply to message #325333] Mon, 23 October 2017 14:51 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4193
Registered: January 2004
Karma: 9
Senior Member
There are no rubber hoses in the tank. They attach to the metal fuel pick up line which is part of the level indicator float assembly. This fits into the top of the tank with a flange and gasket that turns to seal it.

There are two hoses. One is fuel pickup. The other is a vent line.

Emery Stora
77 Kingsley
Frederick, CO

> On Oct 23, 2017, at 12:48 PM, slc wrote:
>
> RF_Burns wrote on Sat, 21 October 2017 09:27
>> In 2010 while the GMC was on the hoist waiting for the engine to be rebuilt, I had the tanks dropped and all the fuel lines changed.
>>
>> X CUT X Back home I dropped the tanks and found the fuel out line on the top of the tank had deteriorated, hard and cracked after only 4
>> years. The hose was SAE 30R7 with a date code of 2007.
>>
>> X CUT X
>> I'd drop the tanks, check for rust inside and the condition of the socks. then replace the lines above the tanks too. Put new seals on the
>> senders because the ethanol will eat that rubber too. Don't forget to replace the short filler hose pieces before they start leaking.
>
>
> ******
>
> Are the fuel pick up hoses inside the tanks rubber??? Is there a way to make them steel? How do you seal where the metal line comes through the
> tank?
> With todays ethanol fuels, it seems silly not to use metal in the tank, doesn't it???
>
> Thanks for your help.
> slc
> Gatsbys' Cruiser
> --
> GatsbysCruise. \
> 74GMC260 Former Glacier Model style. \
> Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
> UBUNTU VOYAGER - Berzin Auto Center in Waukegan
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325338 is a reply to message #325337] Mon, 23 October 2017 15:15 Go to previous messageGo to next message
Richard Denney is currently offline  Richard Denney   United States
Messages: 612
Registered: April 2010
Karma: 2
Senior Member
There is a third hose on each tank for venting the tank during operation.
It has its own barb fitting. The two on the sending unit go to the fuel
pump and to the fill vent.

Rick "not recalling on stock tanks where that vent barb is located, but
it's definitely on top" Denney

On Mon, Oct 23, 2017 at 3:52 PM Emery Stora wrote:

> There are no rubber hoses in the tank. They attach to the metal fuel pick
> up line which is part of the level indicator float assembly. This fits into
> the top of the tank with a flange and gasket that turns to seal it.
>
> There are two hoses. One is fuel pickup. The other is a vent line.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>
>> On Oct 23, 2017, at 12:48 PM, slc wrote:
>>
>> RF_Burns wrote on Sat, 21 October 2017 09:27
>>> In 2010 while the GMC was on the hoist waiting for the engine to be
> rebuilt, I had the tanks dropped and all the fuel lines changed.
>>>
>>> X CUT X Back home I dropped the tanks and found the fuel out line
> on the top of the tank had deteriorated, hard and cracked after only 4
>>> years. The hose was SAE 30R7 with a date code of 2007.
>>>
>>> X CUT X
>>> I'd drop the tanks, check for rust inside and the condition of the
> socks. then replace the lines above the tanks too. Put new seals on the
>>> senders because the ethanol will eat that rubber too. Don't forget to
> replace the short filler hose pieces before they start leaking.
>>
>>
>> ******
>>
>> Are the fuel pick up hoses inside the tanks rubber??? Is there a way
> to make them steel? How do you seal where the metal line comes through the
>> tank?
>> With todays ethanol fuels, it seems silly not to use metal in the tank,
> doesn't it???
>>
>> Thanks for your help.
>> slc
>> Gatsbys' Cruiser
>> --
>> GatsbysCruise. \
>> 74GMC260 Former Glacier Model style. \
>> Located in Waukegan \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS
> FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
>> UBUNTU VOYAGER - Berzin Auto Center in Waukegan
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325339 is a reply to message #325338] Mon, 23 October 2017 15:29 Go to previous messageGo to next message
powerjon is currently offline  powerjon   United States
Messages: 2431
Registered: January 2004
Karma: 7
Senior Member
Too All,

This is an album that I did when I redid the fuel tanks on our coach. You can see the lines on top of the tank. I only use a SAE30R9 rated hose which is a barrier type hose. It should last a long time as todays fuel will not permeant the liner.

http://www.gmcmhphotos.com/photos/g6928-fuel-tank-system-rebuild.html

JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan


> On Oct 23, 2017, at 4:15 PM, Richard Denney wrote:
>
> There is a third hose on each tank for venting the tank during operation.
> It has its own barb fitting. The two on the sending unit go to the fuel
> pump and to the fill vent.
>
> Rick "not recalling on stock tanks where that vent barb is located, but
> it's definitely on top" Denney
>
> On Mon, Oct 23, 2017 at 3:52 PM Emery Stora wrote:
>
>> There are no rubber hoses in the tank. They attach to the metal fuel pick
>> up line which is part of the level indicator float assembly. This fits into
>> the top of the tank with a flange and gasket that turns to seal it.
>>
>> There are two hoses. One is fuel pickup. The other is a vent line.
>>
>> Emery Stora
>> 77 Kingsley
>> Frederick, CO


_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org


J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325345 is a reply to message #325172] Mon, 23 October 2017 18:41 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 2994
Registered: October 2006
Location: Woodstock, IL
Karma: 16
Senior Member
There are 3 basic types of Gates Barricade hose for fuel. Low pressure, high pressure fuel injection, and high pressure submersible for in tank pump to hard line connection.
If you have simple carburated with mechanical or external electric booster pump, you want the first type. If not Barricade type it is obsolete for use with today's fuel. These new hoses have a thermoplastic layer or "barricade". Auto parts stores are not supposed to be selling old type fuel line but there are plenty of old spools of it they need to sell to recoup on. Old type can fail in a very short time. The first time Cinnabar dropped my tanks they did not use the Barricade hose and the line to my Onan started weeping after about 5 years. I just had it all refone last year and had the Aux switch controled in line pump added with fuse and relay system. Works great. I would say you simple cannot expect to drive a GMC in hot weather today without an electric pump to feed the mechanical pump. It clears up instanly when you flip to AUX. Most erroneously concentrate on the fuel line from mech pump to Qjet, but that tubing has pressurized fuel making it resistant to boiling. The problem is before the pump as they are not good at moving vapor. If there is any porosity in your lines this problem is amplified. The old hose takes on "garden soaker" hose characteristics and must be replaced.


John Lebetski
Woodstock, IL
77 Eleganza II
Re: PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325403 is a reply to message #325345] Tue, 24 October 2017 21:25 Go to previous messageGo to next message
JimGunther is currently offline  JimGunther   United States
Messages: 211
Registered: March 2007
Location: West Haven, CT
Karma: 0
Senior Member
Please don't let fear of dropping the tanks stop you.
Logically (i.e. Diagnostic Tree), there are a bunch of little things that could likely contribute to your current issue but - just as important - prevent other problems in the future. With winter coming on, you could do a rebuild and be ready to go before spring.
FWIW: I dropped the tanks (by myself) on mine twice. Stupidly, cut corner the first time and it bit me a few months later. I used dead man jacks first time and those 2x4 block ramp second time (MUCH easier and cleaner).


Jim Gunther
www.LotusV6.com

now former owner - ;( 73 GMC-II 2600
by Explorer
Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note: [message #325412 is a reply to message #325403] Wed, 25 October 2017 11:54 Go to previous message
Keith V is currently offline  Keith V   United States
Messages: 1935
Registered: March 2008
Location: Mounds View,MN
Karma: 4
Senior Member
The vent lines need to be barrier hoses as well since they will often, like every time you fill up, be full of fuel.

My line to the check valve is doing the soaker hose thing, spraying everywhere :(

________________________________
From: Gmclist on behalf of Jim Gunther
Sent: Tuesday, October 24, 2017 9:25:05 PM
To: gmclist-AT-list-DOT-gmcnet-DOT-org
Subject: Re: [GMCnet] PowerLossProblem - Gatsbys' Cruiser is ending the year on a good note:

Please don't let fear of dropping the tanks stop you.
Logically (i.e. Diagnostic Tree), there are a bunch of little things that could likely contribute to your current issue but - just as important -
prevent other problems in the future. With winter coming on, you could do a rebuild and be ready to go before spring.
FWIW: I dropped the tanks (by myself) on mine twice. Stupidly, cut corner the first time and it bit me a few months later. I used dead man jacks first
time and those 2x4 block ramp second time (MUCH easier and cleaner).

--
Jim Gunther
www.LotusV6.com

now former owner - ;(

73 GMC-II 2600
by Explorer

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org



Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
69 Vette
29 Dodge
Previous Topic: Part # for Stock GMC Master Cylinder rebuild kit
Next Topic: [GMCnet] what a difference a spring makes
Goto Forum:
  


Current Time: Wed Dec 13 16:41:54 CST 2017

Total time taken to generate the page: 0.04970 seconds