Home » Public Forums » GMCnet » Fuel Tank Re-install...
| Fuel Tank Re-install... [message #247453] |
Mon, 14 April 2014 21:44  |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Hey Guys I need some help here....
A friend of mine pulled both fuel tanks from my coach. 4 months ago and it is up on jack stands waiting to be finished.
I didn't take them out, so I'm not sure exactly how they go back in?
I'm not even sure I have all the fasteners?
I am fairly handy mechanically but would love some help re-installing them since my friend wont be back for at least another 3-4 weeks.
So I would pay someone familiar with this job specifically, to help me do it or just do the job?
I live in Graham, WA.
Thanks again,
Steve
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: Fuel Tank Re-install... [message #247463 is a reply to message #247453] |
Tue, 15 April 2014 05:41  |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Steve,
3 bolts, and 2 nuts, hold each tank in.
On the front there are 3 that bolt into the L shaped bracket on the tank, through the frame cross member.
The back of the tank is suspended from the frame cross member by 2 threaded hooks that go through the holes in the tank straps. The nuts hold the tank straps to the threaded rods.
I am currently contemplating that same task as soon as I replace the brake hard lines, that started weeping brake fluid when I wiped the dirt off of them. So, I too would like to know any tips for re-mounting with rubber lines, IE: put 1/2" fill connector and elbow on the hard fill line first, or on the tank first, etc.
It shouldn't be that hard, but I suspect there is a trick or two that makes it less painful. I want to say there are some nuggets of wisdom in the archives on the subject.
Good luck
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: Fuel Tank Re-install... [message #247464 is a reply to message #247453] |
Tue, 15 April 2014 05:49 |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Senior Member |
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To be more clear on the fasteners:
You need to have six ~1" bolts that will thread into the front bracket on the tanks.
You will also need four threaded hooks, about 6" in length. The hook part is actually more like a single 110 degree bend about 2" from the non-threaded end of the rod, and the bolts and washers to go on the threaded end to capture the tank straps.
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: Fuel Tank Re-install... [message #247466 is a reply to message #247453] |
Tue, 15 April 2014 06:59 |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Senior Member |
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Having just completed this...I was on my back with minimal clearance
Rear tank first, on a large piece of cardboard to protect your new paint, connect your sender wires and hoses, vent is the outer line, the line closest to the center is the supply.
Don't forget to add about 8' of 1/4" to the generator port. Have your fill couplings attached to tank and tight, these are tough to tighten with tank in place.
Install front tank vapor line, a piece of 5/16" line above crossmember and feed it to separator along with rear tank vapor, these get tee'd together and go to the bottom port of the separator in the wheel well.
Slide tank under the coach. Feed onan line through frame
Lift rear of tank and install "J" hook into tank strap, the little hook on the strap can rest on the frame temporarily.
Lift front of tank and slide 4x4 or floor jack under tank. While raising tank, align fill tube...be sure your clamps are already there. continue raising tank.
Install bolts.
Front tank is same, but vapor line needs to be connected to tank after you slide it under coach, fill Tee coupler is much more difficult.
Tighten fill lines...I had my fill lines out, painted. (Type 1 filler with smaller sections of pipe) I used pieces of a bicycle tube around the filler where the hose clamp attaches to the holder. Make sure everything is tight, tie wrap all your air hoses and fuel lines ensuring nothing will rub from vibration.JWID
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
[Updated on: Tue, 15 April 2014 07:16] Report message to a moderator |
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| Re: [GMCnet] Fuel Tank Re-install... [message #247477 is a reply to message #247453] |
Tue, 15 April 2014 09:00 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day Steve,
If you don't have copies of the Maintenance Manual (MM) X-7525 and Parts Book (PB) 78Z click on the link below and download them:
http://www.bdub.net/factory-manuals.html
PB 78Z has an Illustrated Parts Breakdown of the fuel tanks on page 12-2 & 3 which shows the tanks all the attaching hardware and
lines.
MM X-7525 Section 8 - Fuel Tank and Exhaust has line drawings and photographs that will help you perform this task.
Also there are LOTS of photographs on the PhotoSite just do a search for Fuel and or Tanks and or Gas and I'm sure you'll find all
you need to know.
Regards,
Rob M.
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-----Original Message-----
From: Steve
Hey Guys I need some help here....
A friend of mine pulled both fuel tanks from my coach. 4 months ago and it is up on jack stands waiting to be finished.
I didn't take them out, so I'm not sure exactly how they go back in?
I'm not even sure I have all the fasteners?
I am fairly handy mechanically but would love some help re-installing them since my friend wont be back for at least another 3-4
weeks.
So I would pay someone familiar with this job specifically, to help me do it or just do the job?
I live in Graham, WA.
Thanks again,
Steve
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Fuel Tank Re-install... [message #247486 is a reply to message #247453] |
Tue, 15 April 2014 10:48 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I did this several years ago. Some here would say I did it "wrong" because I used mostly new rubber barrier hose, with 'polyarmor' on top of the tanks only. Hopefully this photo album will be helpful:
http://www.gmcmhphotos.com/photos/g5520-gas-tank-fuel-line-project-6-10.html
Not a real difficult job at all.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Fuel Tank Re-install... [message #247487 is a reply to message #247453] |
Tue, 15 April 2014 10:50 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Steve,
If you get the referenced publications, you will get a good idea how easy this really is. (PITA Yes, but not actually difficult.)
This from a guy that has had is fuel tanks down more times than should have happened.
I do have two pieces of advice that you may find worthwhile.
First, it is far easier to put the fill piping back in place when the tanks are installed than it is to hit the connections while jugging the tanks back into place. So, take down that plumbing now if it is there and put it back later.
Second, (and last from me) is get a set of the Hazard Fright cargo straps are perpetually in sale at about 10$ for a set of 4. With a little thinking, you will see that these can do a great job of lifting and supporting the tanks and allowing you free access to the area under the tanks.
Too bad I am not in striking range, I could make this go real easily. You are in the right place to get some help, but you still might grab a copy of the GMC Assist list (aka Black List) and call a few local people to find if one has experience with this operation.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Fuel Tank Re-install... [message #247543 is a reply to message #247453] |
Tue, 15 April 2014 23:02 |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Senior Member |
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I think I may have found someone to help me with this project!!
How long should it take someone familiar with the GMC?
I have a couple of drawings for fuel line routing and fuel vent routing by Rick Williams I cant find them online? But I have them printed out...
It calls for:
1/2" line for the filler tube vent to the steel tube along the frame rail
1/4" Line for the Onan
And 3/8" line everywhere else
Hope that's right?
Which port is vent and which is fuel on the senders?
Thanks for all the help!
Steve
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: [GMCnet] Fuel Tank Re-install... [message #247547 is a reply to message #247543] |
Tue, 15 April 2014 23:32 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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22' of 3/8
33' of 5/16
11' of 1/4
If you have a coachman, you'll need more of the 1/4.
While your at it, change the fuel selector valve, as the ethanol has sarted
on the rubber.
Replace fuel pump if older than 4 years, again ethanol.
On Tue, Apr 15, 2014 at 9:02 PM, Steve <quadracerx@aol.com> wrote:
>
>
> I think I may have found someone to help me with this project!!
>
> How long should it take someone familiar with the GMC?
>
> I have a couple of drawings for fuel line routing and fuel vent routing by
> Rick Williams I cant find them online? But I have them printed out...
>
> It calls for:
>
> 1/2" line for the filler tube vent to the steel tube along the frame rail
>
> 1/4" Line for the Onan
>
> And 3/8" line everywhere else
>
> Hope that's right?
>
> Which port is vent and which is fuel on the senders?
>
> Thanks for all the help!
>
> Steve
> --
> 75 26' GMC Glenbrook
> 75 26' GMC Elaganza "The Parts Coach"
>
> Puyallup, Washington
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Fuel Tank Re-install... [message #247575 is a reply to message #247543] |
Wed, 16 April 2014 08:36 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| quadracerx1 wrote on Wed, 16 April 2014 00:02 |
I think I may have found someone to help me with this project!!
How long should it take someone familiar with the GMC?
I have a couple of drawings for fuel line routing and fuel vent routing by Rick Williams I cant find them online? But I have them printed out...
It calls for:
1/2" line for the filler tube vent to the steel tube along the frame rail
1/4" Line for the Onan
And 3/8" line everywhere else
Hope that's right?
Which port is vent and which is fuel on the senders?
Thanks for all the help!
Steve
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Steve,
Glad you have found a friend.
It should only take the two of you a morning to put the tanks back up. The first one will teach you enough so the second goes real fast.
I can't find my pictures, but if you take a screwdriver and a light hammer and tap the ears on the retainer, you can get the sending unit out easily. Then you can mark which is the fuel and which is the vent. Also, if the O-ring in there has not been replaced, this is a good time. They are a common part and not expensive.
As I recall, the vent is on the right and the draw on the left as
you look into the barbs.
The vapor vents that go to the left wheel well are 5/16.
A Suggestion: Run the two fill vent lines as far forward and as high as you can. Then T them together to go up to the fill neck. This seems to be less important on a 26, but it does help filling go faster without random shut-offs. You can use the same T if it survives. Mine didn't.
Believe JimK about the selector valve. The bitch about it is that there is no exact replacement, so what you put in will be upside down and backwards from the old one. So, solder a ground wire onto one of the mounting ears and screw it to the underside of the coach floor.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Fuel Tank Re-install... [message #247585 is a reply to message #247453] |
Wed, 16 April 2014 09:17 |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Senior Member |
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So is all of the vent line 5/16"?
Im thinking of adding a "pusher" electric pump to augment the factory mechanical pump and maybe a filter too? I see a lot of people using the Carter 4070? Will it overpower the mechanical?
Thanks again, we will try to get the tanks put in by next Wed. wish me luck....
Again, thanks for all the help... On the selector valve, is that something I can do after the tanks are in? Or is it best to do now?
Steve
75 26' GMC Glenbrook
Puyallup, Washington
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| Re: [GMCnet] Fuel Tank Re-install... [message #247644 is a reply to message #247643] |
Wed, 16 April 2014 18:43 |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Senior Member |
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| USAussie wrote on Wed, 16 April 2014 18:23 |
... you can install a small Facet pumps below in the line that comes from the Aux tank to the selector valve. Wire it to the selector valve. When you switch to AUX the pump comes on and pressurizes the inlet of the mechanical fuel pump...
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This was done by the PO in my Birch. Was quite confusing at first with the t-ed line for the Onan on the same circuit, and all of it wire-tied in place with a rats nest of loose wires.
Sadly, I did not get nearly enough seat time to render judgement, I'll defer to Rob on that. Though in the 60 miles I managed to go before the rod knock, I never once had vapor lock...so there is that... 
On another note, I have seen many refer to the tank vent as 1/2" but on mine it is 3/8", the same size as the fuel feed. Was this a change on post 75 tanks, or do I have modded pickups?
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: [GMCnet] Fuel Tank Re-install... [message #247662 is a reply to message #247652] |
Wed, 16 April 2014 20:48 |
Joe Weir
Messages: 769
Registered: February 2013
Location: Columbia, SC
Karma: 7
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Senior Member |
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| Matt Colie wrote on Wed, 16 April 2014 19:18 |
On most that I have seen, the tank - fill vent is 3/8 to the T and 1/2 from the T to the fill neck (under the driver's left elbow). That T is the one that I moved up to under the cad floor and it made an amazing difference in the capability to put fuel in the tanks.
Matt
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Ah, ok, thanks. That makes sense. I have not messed with the vent line at the fill neck yet.
76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center...
Columbia, SC.
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| Re: Fuel Tank Re-install... [message #247758 is a reply to message #247453] |
Thu, 17 April 2014 18:15 |
quadracerx1
Messages: 207
Registered: April 2013
Location: Puyallup, Washington
Karma: 1
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Senior Member |
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I'm trying to find a complete color coded diagram for the fuel lines and vent system. I looked in the manual and got even more confused...LOL
1) Anyone know of a good accurate diagram?
2) Also, has anyone used this style of tubing:
http://www.jegs.com/i/JEGS-Performance-Products/555/159236/10002/-1?parentProductId=2344009
Reason I ask is, my coach is carbureted now but I might elect to go to Fuel Injection in the future. So I would like to do the lines once. With this nylon high pressure stuff if it will work?
I am also going to use a Carter 7040 pump and a marine style fuel filter with replaceable elements.
3) Should it go before the selector valve?
Thanks, again for everything you guys do...
Steve
75 26' GMC Glenbrook
Puyallup, Washington
[Updated on: Thu, 17 April 2014 18:16] Report message to a moderator |
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