Home » Public Forums » GMCnet » [GMCnet] Pressure in the tank?
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270393 is a reply to message #270386] |
Sun, 25 January 2015 17:35   |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
|
Senior Member |
|
|
Shouldn't be that much pressure. Crushed lines from collapsed body pads or collapsed hoses from ethanol?
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
|
|
|
|
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270398 is a reply to message #270394] |
Sun, 25 January 2015 18:37 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
""Your tank venting system is not venting pressure as fast as that Crapahol
Gasoline is creating it. Be sure that you have the exactly correct gas cap
for the coach, and that the venting lines that go to the charcoal
canister(s) are not pinched shut where they cross between the body and
frame rail near the canister(s) You will have to remove the inner fender on
the passenger side of the coach to inspect the canister(s).
Jim Hupy
Salem, OR
78 GMC Royale 403""
Thank God ethanol is not being discontinued--we may have to blame poor or total lack of maintenance.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270403 is a reply to message #270386] |
Sun, 25 January 2015 19:40 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
If I understand the vent system correctly, excess tank pressure build up should force the vapors (pressure) to flow through the vapor separator, on to the charcoal canisters up front. and eventually into the intake manifold to be burned.
Any blockage in that route can cause a pressure build up in the tanks. So I would initially look at the vapor separator. Then look at the hoses especially where they cross over the frame. The hoses could be deteriorated or smashed because of poor body isolators. Also part of that route is a steel line that crosses under the step. It could be blocked from rust or stuck hose pieces inside it. Finally there are the canister(s) themselves. I have never had one apart but I do know that they need to be allowed to pass air through them.
You have a blockage somewhere in that route or are boiling off fuel faster than the vent system can handle.
It is little early in the season but winter mix fuel has a lower boiling point called RVP. When it gets warm outside winter fuel will evaporate quickly causing problems. Ethanol mixed fuels have a 1.0 RVP exception from EPA the rules so it will boil off at even lower temperatures. Usually people do not start complaining about this until April or May when they try to run old winter blend fuel on hotter highways.
Either way the fuel vent system on your coach needs to be looked at.
Good Luck
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270409 is a reply to message #270386] |
Sun, 25 January 2015 20:42 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
|
Senior Member |
|
|
Stephen Thomas wrote on Sun, 25 January 2015 12:50 I Just got sprayed with gasoline when I took the gas cap off. Why is
there so much pressure in the tank? It's also idling fast and not taking
hills like it should.
Thanks
Steve
78 Eleganza
Santa Cruz
(currently in Monterey)
Steve,
We had a '78 that built pressure and I almost got a bath once. It built pressure so badly the gas gauge actually went down as the tanks ballooned. Venting would bring it back to near full... but was not a good way to live. Our problem was the separator valve itself. This is the little triangle thingy in front of the lead bogie on the driver's side. It usually has a tin protector to keep mud and rocks away.
Be careful as these little guys are plastic and sometimes getting brittle. I suggest several tests. The top hose (top of the triangle) is the canister hose. I would take it (carefully) loose and blow through the canisters. You can patch on a longer hose so you don't have to stand on your head. There will be some resistance but you can move air if all is well. Now see if you can blow back into the tank through the bottom hose. If air moves then check the separator itself. If you can get it loose it should rattle when you shake it.There is a ball that floats to the top if gas gets in the separator and the ball closes the top tube. (You don't want gas in the canister.)
You should be able to blow through the separator from bottom to top. If not you can try to tap the ball loose. If there is no rattle and air moves through, or gas was in the line to the canister, you need another separator. The venders have them or you can try a Corvette online parts place. You just have to see the picture of it... I have not part number.
If there is gas getting to the canisters this can cause smells, running rich and/or dying from flooding.
I will try a preemptive strike here... there are some who suggest plugging the canisters off and letting the hose vent into the air. This is bad on four counts. 1) You won't pass smog. 2) The canister is a filter when the tanks are "inhaling" as they cool. You don't want crud going in through the hose. 3) The separator is there because raw gas can belch out of full tanks. I don't want to slop gas out on the coach, and street. 4) Canisters were the best smog device ever. Fumes that you would loose in the air... making smog... are used to drive down the road later. You get to use what would have been vented into the air.
Have fun on the coast.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270495 is a reply to message #270409] |
Mon, 26 January 2015 21:26 |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
|
Junior Member |
|
|
Lots of great advice from everyone, thanks. I was a little worried, but I
did make it home okay. Unfortunately I won't be able to get into trouble
shooting until next weekend.
A couple of years ago, I replaced all (or most...not sure) of the lines and
yes, the complete lack of body/frame isolators had caused some crimping.
All of the isolators were replaced at the same time. I do remember that the
separator looked pretty haggard, but I didn't know what it was, so left it
alone. Seems like a good place to start.
Interesting about the winter gas. It seems odd to me that they'd use a
different gas for winter in CA. It was in the 80s yesterday...warm but not
unheard of for January.
Also, the hesitation that was happening was exactly like the hesitation I
had with a clogged fuel filter. Maybe the extra pressure in the tank has
pushed some extra crud into the lines?
Anyway, thanks again for the help and thanks Robert for the schematics
Steve Thomas
78 Eleganza
Santa Cruz
On Sun, Jan 25, 2015 at 6:42 PM, George Beckman wrote:
> Stephen Thomas wrote on Sun, 25 January 2015 12:50
>> I Just got sprayed with gasoline when I took the gas cap off. Why is
>> there so much pressure in the tank? It's also idling fast and not taking
>> hills like it should.
>>
>> Thanks
>> Steve
>> 78 Eleganza
>> Santa Cruz
>> (currently in Monterey)
>
> Steve,
>
> We had a '78 that built pressure and I almost got a bath once. It built
> pressure so badly the gas gauge actually went down as the tanks ballooned.
> Venting would bring it back to near full... but was not a good way to
> live. Our problem was the separator valve itself. This is the little
> triangle
> thingy in front of the lead bogie on the driver's side. It usually has a
> tin protector to keep mud and rocks away.
>
> Be careful as these little guys are plastic and sometimes getting brittle.
> I suggest several tests. The top hose (top of the triangle) is the canister
> hose. I would take it (carefully) loose and blow through the canisters.
> You can patch on a longer hose so you don't have to stand on your head.
> There
> will be some resistance but you can move air if all is well. Now see if
> you can blow back into the tank through the bottom hose. If air moves then
> check the separator itself. If you can get it loose it should rattle when
> you shake it.There is a ball that floats to the top if gas gets in the
> separator and the ball closes the top tube. (You don't want gas in the
> canister.)
>
> You should be able to blow through the separator from bottom to top. If
> not you can try to tap the ball loose. If there is no rattle and air moves
> through, or gas was in the line to the canister, you need another
> separator. The venders have them or you can try a Corvette online parts
> place. You
> just have to see the picture of it... I have not part number.
>
> If there is gas getting to the canisters this can cause smells, running
> rich and/or dying from flooding.
>
> I will try a preemptive strike here... there are some who suggest plugging
> the canisters off and letting the hose vent into the air. This is bad on
> four counts. 1) You won't pass smog. 2) The canister is a filter when the
> tanks are "inhaling" as they cool. You don't want crud going in through the
> hose. 3) The separator is there because raw gas can belch out of full
> tanks. I don't want to slop gas out on the coach, and street. 4) Canisters
> were
> the best smog device ever. Fumes that you would loose in the air... making
> smog... are used to drive down the road later. You get to use what would
> have been vented into the air.
>
> Have fun on the coast.
> --
> '74 Eleganza, SE, Howell + EBL
> Best Wishes,
> George
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270506 is a reply to message #270495] |
Tue, 27 January 2015 01:53 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
Steve, I can find you an EPA site that gives you the RVP requirements by county in the other 49 states, but California operates under an EPA exception and the rules are set by the California Air Resources Board (CARB).
If you want to find out what is going on in California, I would dig around for information from CARB. I have never bothered since I seldom go to that state other than to pester Jim K. every couple of years. I have relatives all over California but I never visit them.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270886 is a reply to message #270409] |
Sat, 31 January 2015 16:10 |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
|
Junior Member |
|
|
So far, visually inspecting the hoses, it looks like the hose from the
separator to the canister is one of the few I've not yet replaced. There is
also a place where it looks like the body was pinching it. Using a small
bike pump with a guage, I can fairly easily blow air through it from the
separator end, but i'm still going to replace it tomorrow (had to order the
hose). The hose from the tank to the separator is about 2 years old and in
good shape.
When I blow air through the separator, it flows freely in both directions.
Just for kicks, I blew air into the hose that comes from the tank. it
seemed easy enough, but gas came spraying back out when I stopped. Is that
normal? (The tank is nearly full, by the way.) When I put the hose back on
the separator and blow air through the top port of the separator, only air
comes back through the separator (no gas). Seems to me that the separator
is good otherwise I would've gotten sprayed again.
Anyway, I guess the test will be to drive for a while after I replace the
hose tomorrow and see what happens.
Steve Thomas
78 Eleganza
Santa Cruz
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270893 is a reply to message #270886] |
Sat, 31 January 2015 17:24 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
If you read here
http://www.gmcmhphotos.com/photos/data/4634/TANK_VENTS1.pdf
There is almost a 3/4 inch,vent hole (2 vents) the top of each tank, it is
almost impossible to build up pressure in a gas tank ( unless the vents are
plugged :)
ERF
On Saturday, January 31, 2015, Stephen Thomas wrote:
> So far, visually inspecting the hoses, it looks like the hose from the
> separator to the canister is one of the few I've not yet replaced. There is
> also a place where it looks like the body was pinching it. Using a small
> bike pump with a guage, I can fairly easily blow air through it from the
> separator end, but i'm still going to replace it tomorrow (had to order the
> hose). The hose from the tank to the separator is about 2 years old and in
> good shape.
>
> When I blow air through the separator, it flows freely in both directions.
> Just for kicks, I blew air into the hose that comes from the tank. it
> seemed easy enough, but gas came spraying back out when I stopped. Is that
> normal? (The tank is nearly full, by the way.) When I put the hose back on
> the separator and blow air through the top port of the separator, only air
> comes back through the separator (no gas). Seems to me that the separator
> is good otherwise I would've gotten sprayed again.
>
> Anyway, I guess the test will be to drive for a while after I replace the
> hose tomorrow and see what happens.
>
> Steve Thomas
> 78 Eleganza
> Santa Cruz
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270900 is a reply to message #270886] |
Sat, 31 January 2015 19:16 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Steve,
I direct your attention to MM X-7525 / Section 8 - Fuel and Exhaust / Page 8-2 / Figure 1 - Evaporation Control System.
Note that line that attaches to the bottom of the liquid fuel separator connects to both tanks through a "T" fitting. Also note the
location of the vent fitting on the fuel tanks.
You stated "the tank is nearly full" below. It is possible that the fuel level inside the tanks is high enough that the vents are
submerged. When you blew into the line you pressurized the tanks and when you stopped the fuel rushed back into the vent line(s) and
sprayed out the end of the line you had disconnected.
I also noted something else when reading the MM and I direct your attention to MM X-7525 / Section 8 - Fuel and Exhaust / Page 8-8 /
Fuel Tank Leak Test Procedure / Step 2.
2. Apply air pressure to tank through open vent tube. Use extreme caution to prevent rupturing the tank. When air can be heard
escaping from the filler neck cap (approximately 1 to 1-1/2 lbs. of pressure) pinch the fuel line hose to retain pressure.
This tells me that the fuel filler cap on a GMC should be vented is it possible that yours is not or it's not relieving pressure at
1 - 1/12 psi.
Here's some part numbers for your 77-78 GMC:
Stant: G-807 (locking)
Stant: 11807
Stant: 31722
Napa (Balkamp) 703-1049
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Stephen Thomas
Sent: Sunday, February 01, 2015 9:10 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Pressure in the tank?
So far, visually inspecting the hoses, it looks like the hose from the
separator to the canister is one of the few I've not yet replaced. There is
also a place where it looks like the body was pinching it. Using a small
bike pump with a guage, I can fairly easily blow air through it from the
separator end, but i'm still going to replace it tomorrow (had to order the
hose). The hose from the tank to the separator is about 2 years old and in
good shape.
When I blow air through the separator, it flows freely in both directions.
Just for kicks, I blew air into the hose that comes from the tank. it
seemed easy enough, but gas came spraying back out when I stopped. Is that
normal? (The tank is nearly full, by the way.) When I put the hose back on
the separator and blow air through the top port of the separator, only air
comes back through the separator (no gas). Seems to me that the separator
is good otherwise I would've gotten sprayed again.
Anyway, I guess the test will be to drive for a while after I replace the
hose tomorrow and see what happens.
Steve Thomas
78 Eleganza
Santa Cruz
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270971 is a reply to message #270900] |
Sun, 01 February 2015 16:10 |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma: 2
|
Senior Member |
|
|
The gas cap is vented but must hold about 1 pound before venting. They test for this every year in Tucson, AZ. The Stant caps are made to hold about 2 pounds according to their documentation. In the summer in Arizona (110 degrees), with winter-blend (high RVP) gas, the fuel vapor cannot vent fast enough through the canister so some pressure builds up. If your fill vent is restricted then it can blow gas out of the fill tube when you remove the cap. It is my opinion that this is normal and you just have to wait a few seconds (30? 60?) for the pressure to bleed off via the canister before removing the cap and be careful.
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270984 is a reply to message #270971] |
Sun, 01 February 2015 18:36 |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
|
Junior Member |
|
|
I just finished replacing the remainder of the hose, and can say with
certainty now, that all of the lines in the system are good, unobstructed
and properly routed. I can easily blow through everything from the tank
(btw: I only have one) to the carb. There was some resistance blowing
through the charcoal canister, but it still wasn't hard to get air through.
I don't know if the gas cap is correct or not, but it sure seems like it
had more than 2 psi behind it when I got sprayed last weekend. It may be
worth while to replace it with one I know to be correct before trying to
get it smogged next week. I'll also know more the next time I drive it for
a while and will definitely be careful taking the cap off from now on.
Steve Thomas
78 Eleganza
Santa Cruz, CA
On Sun, Feb 1, 2015 at 2:10 PM, Armand Minnie wrote:
> The gas cap is vented but must hold about 1 pound before venting. They
> test for this every year in Tucson, AZ. The Stant caps are made to hold
> about 2
> pounds according to their documentation. In the summer in Arizona (110
> degrees), with winter-blend (high RVP) gas, the fuel vapor cannot vent fast
> enough through the canister so some pressure builds up. If your fill vent
> is restricted then it can blow gas out of the fill tube when you remove the
> cap. It is my opinion that this is normal and you just have to wait a few
> seconds (30? 60?) for the pressure to bleed off via the canister before
> removing the cap and be careful.
> --
> Armand Minnie
> Marana, AZ
> '76 Eleganza II TZE166V103202
> http://www.minniebiz.com
> http://www.gmcws.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270993 is a reply to message #270984] |
Sun, 01 February 2015 21:57 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
You drop the tanks?
On Sunday, February 1, 2015, Stephen Thomas wrote:
> I just finished replacing the remainder of the hose, and can say with
> certainty now, that all of the lines in the system are good, unobstructed
> and properly routed. I can easily blow through everything from the tank
> (btw: I only have one) to the carb. There was some resistance blowing
> through the charcoal canister, but it still wasn't hard to get air through.
> I don't know if the gas cap is correct or not, but it sure seems like it
> had more than 2 psi behind it when I got sprayed last weekend. It may be
> worth while to replace it with one I know to be correct before trying to
> get it smogged next week. I'll also know more the next time I drive it for
> a while and will definitely be careful taking the cap off from now on.
>
> Steve Thomas
> 78 Eleganza
> Santa Cruz, CA
>
>
>
> On Sun, Feb 1, 2015 at 2:10 PM, Armand Minnie > wrote:
>
>> The gas cap is vented but must hold about 1 pound before venting. They
>> test for this every year in Tucson, AZ. The Stant caps are made to hold
>> about 2
>> pounds according to their documentation. In the summer in Arizona (110
>> degrees), with winter-blend (high RVP) gas, the fuel vapor cannot vent
> fast
>> enough through the canister so some pressure builds up. If your fill vent
>> is restricted then it can blow gas out of the fill tube when you remove
> the
>> cap. It is my opinion that this is normal and you just have to wait a few
>> seconds (30? 60?) for the pressure to bleed off via the canister before
>> removing the cap and be careful.
>> --
>> Armand Minnie
>> Marana, AZ
>> '76 Eleganza II TZE166V103202
>> http://www.minniebiz.com
>> http://www.gmcws.org
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #270999 is a reply to message #270993] |
Sun, 01 February 2015 22:12 |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
|
Junior Member |
|
|
No. After dropping the tanks a couple of years ago, I installed a trap door
to better access the hose connections on the top of the remaining tank.
Today, I was very glad I did.
On Sun, Feb 1, 2015 at 7:57 PM, gene Fisher wrote:
> You drop the tanks?
>
> On Sunday, February 1, 2015, Stephen Thomas wrote:
>
>> I just finished replacing the remainder of the hose, and can say with
>> certainty now, that all of the lines in the system are good, unobstructed
>> and properly routed. I can easily blow through everything from the tank
>> (btw: I only have one) to the carb. There was some resistance blowing
>> through the charcoal canister, but it still wasn't hard to get air
> through.
>> I don't know if the gas cap is correct or not, but it sure seems like it
>> had more than 2 psi behind it when I got sprayed last weekend. It may be
>> worth while to replace it with one I know to be correct before trying to
>> get it smogged next week. I'll also know more the next time I drive it
> for
>> a while and will definitely be careful taking the cap off from now on.
>>
>> Steve Thomas
>> 78 Eleganza
>> Santa Cruz, CA
>>
>>
>>
>> On Sun, Feb 1, 2015 at 2:10 PM, Armand Minnie > > wrote:
>>
>>> The gas cap is vented but must hold about 1 pound before venting. They
>>> test for this every year in Tucson, AZ. The Stant caps are made to hold
>>> about 2
>>> pounds according to their documentation. In the summer in Arizona (110
>>> degrees), with winter-blend (high RVP) gas, the fuel vapor cannot vent
>> fast
>>> enough through the canister so some pressure builds up. If your fill
> vent
>>> is restricted then it can blow gas out of the fill tube when you remove
>> the
>>> cap. It is my opinion that this is normal and you just have to wait a
> few
>>> seconds (30? 60?) for the pressure to bleed off via the canister before
>>> removing the cap and be careful.
>>> --
>>> Armand Minnie
>>> Marana, AZ
>>> '76 Eleganza II TZE166V103202
>>> http://www.minniebiz.com
>>> http://www.gmcws.org
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Pressure in the tank? [message #271023 is a reply to message #270999] |
Mon, 02 February 2015 09:33 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
Most hose pinch happen on the top of the tanks---put metal up there
On Sunday, February 1, 2015, Stephen Thomas wrote:
> No. After dropping the tanks a couple of years ago, I installed a trap door
> to better access the hose connections on the top of the remaining tank.
> Today, I was very glad I did.
>
> On Sun, Feb 1, 2015 at 7:57 PM, gene Fisher > wrote:
>
>> You drop the tanks?
>>
>> On Sunday, February 1, 2015, Stephen Thomas > wrote:
>>
>>> I just finished replacing the remainder of the hose, and can say with
>>> certainty now, that all of the lines in the system are good,
> unobstructed
>>> and properly routed. I can easily blow through everything from the tank
>>> (btw: I only have one) to the carb. There was some resistance blowing
>>> through the charcoal canister, but it still wasn't hard to get air
>> through.
>>> I don't know if the gas cap is correct or not, but it sure seems like
> it
>>> had more than 2 psi behind it when I got sprayed last weekend. It may
> be
>>> worth while to replace it with one I know to be correct before trying
> to
>>> get it smogged next week. I'll also know more the next time I drive it
>> for
>>> a while and will definitely be careful taking the cap off from now on.
>>>
>>> Steve Thomas
>>> 78 Eleganza
>>> Santa Cruz, CA
>>>
>>>
>>>
>>> On Sun, Feb 1, 2015 at 2:10 PM, Armand Minnie
>>> > wrote:
>>>
>>>> The gas cap is vented but must hold about 1 pound before venting.
> They
>>>> test for this every year in Tucson, AZ. The Stant caps are made to
> hold
>>>> about 2
>>>> pounds according to their documentation. In the summer in Arizona
> (110
>>>> degrees), with winter-blend (high RVP) gas, the fuel vapor cannot
> vent
>>> fast
>>>> enough through the canister so some pressure builds up. If your fill
>> vent
>>>> is restricted then it can blow gas out of the fill tube when you
> remove
>>> the
>>>> cap. It is my opinion that this is normal and you just have to wait a
>> few
>>>> seconds (30? 60?) for the pressure to bleed off via the canister
> before
>>>> removing the cap and be careful.
>>>> --
>>>> Armand Minnie
>>>> Marana, AZ
>>>> '76 Eleganza II TZE166V103202
>>>> http://www.minniebiz.com
>>>> http://www.gmcws.org
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>>
>>
>> --
>> Gene Fisher -- 74-23,77PB/ore/ca
>> “Give a man a fish; you have fed him for today --- give him a URL and
>> -------
>> http://gmcmotorhome.info/
>> Alternator Protection Cable
>> http://gmcmotorhome.info/APC.html
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
Goto Forum:
Current Time: Sun Sep 29 19:57:05 CDT 2024
Total time taken to generate the page: 0.01662 seconds
|
GMCforum
Search
Help
Register
Login
Home
