Fuel leak 91 Wagoneer

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Topic author
swconnelly22
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Joined: Sun Aug 12, 2018 5:47 pm

Fuel leak 91 Wagoneer

Post by swconnelly22 »

Wagoneer was dripping gas when filling the tank and leaking a little when the tank was full. I replaced the filler hoses (fixed the first problem) and the vent valve that’s under the back seat. Now it’s dumping a ton of gas which is then running out of the skid plate when I drive it then stop (and tank full-ish). I see some diagrams showing another vent valve lower down? Could this be my issue? If so, do I have to drop the tank to get to it? Any other ideas?
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Stuka
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Re: Fuel leak 91 Wagoneer

Post by Stuka »

You most likely have cracked fuel lines. How do they look coming out of the pickup?
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swconnelly22
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Re: Fuel leak 91 Wagoneer

Post by swconnelly22 »

Old but fine for the couple of inches I can see. Think I should just drop the tank and assess the whole situation?
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tgreese
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Re: Fuel leak 91 Wagoneer

Post by tgreese »

The TSM should show you a detailed picture of the fuel tank and its plumbing. I don't have a '91 TSM, but you can buy the book on CD-ROM here for about $20 - https://www.rockauto.com/en/moreinfo.ph ... 94&jsn=365

You need to look at the fuel pickup and return lines, and the vapor recovery system, as well as the filler hoses. Vapor recovery typically has a liquid check valve (anti-roll-over valve) at each corner of the tank in a grommet of some type. These vapor lines will have short lengths of rubber hose for connections, just like the fuel lines to the engine. The plastic tanks have been known to crack, but not very often - usually they are fine and it's some rubber connecting part that's deteriorated.
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tgreese
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Re: Fuel leak 91 Wagoneer

Post by tgreese »

If you drop the tank, it would give you access to the interior of the frame rail next to the fuel tank that is notorious for rusting in these cars. If I had the tank out, I would evaluate the frame rail carefully, and clean, paint and treat the frame and skid plate to hold off the elements for a bit longer.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

Topic author
swconnelly22
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Re: Fuel leak 91 Wagoneer

Post by swconnelly22 »

The rubber that I can see is fine. I just need to suck it up and drop the tank for a thorough inspection. Thanks for the info y’all!

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Re: Fuel leak 91 Wagoneer

Post by candymancan »

Did you remove the inspection plate under thr bench seat and check all the plumbing there .
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1990 Jeep Grand Wagoneer 155k
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Topic author
swconnelly22
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Joined: Sun Aug 12, 2018 5:47 pm

Re: Fuel leak 91 Wagoneer

Post by swconnelly22 »

Sure did and everything looks good there
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