Srdayflyer wrote: ↑Wed May 10, 2023 8:56 pm
not sure what year your rig is but my 83 had the same issue, the 83 has 2 rollover/vent check valves with rubber gromets both were shot and the same thing downhill leak full thank leak anything over 1/2 full with fuel ,sloshing around a fuel leak check your service manual to see if yours has 1-2 check valves
As per the signature, it's a '72 Wagoneer.
Shouldn't have any check valves. '70-79 is all more or less the same tank and I'm 98% sure they don't have check valves, as I put a '79 tank+filler in and it doesn't seem to have them. Maybe that was associated with what I assumed to be charcoal canister stuff though.
@W300, based on what I've read, it's best to stay away from those plastic tanks, as everything about them seems to just not work out very well.
https://forums.ifsja.org/forum/tire-kic ... k?t=104880
If you're not too attached to keeping the spare tire where it is I'd be tempted to go for a rear-mount BJ's tank or an S10 tank. You'll have to run a regulator with an electric fuel pump if you're still carbureted, but they're reliable, easy to find parts for, easy to work on...
Or if you wanted, I have the stock tank out of the '71; the seem around the middle seeps a little bit, but you could have it as is, or for a little more I'd be willing to fill it with water and weld that seem up for you.
I can't find it now but in the last couple months there was somebody asking about a company that claimed to be making 40-gallon tanks that go in the factory location (the company also makes a rear-mounted tank for dual tanks), which might be an option too, although I'd be careful, as they're a company trying to sell these things and there aren't any pics--it's not like they're a private seller, where all you have to do is ask.
'71 Wagoneer (DD)
-B350 (HEI, iron 4-barrel, Edelbrock 1406), TH400, D20
-'74 D44 front (nonpower discs)
-custom headliner
-Front shoulder belts (rears eventually)
viewtopic.php?t=23070
There are 2 major differences between new Wranglers and FSJs. FSJs are meant to be both utilitarian and capable, not just capable. FSJs are also rarely initially recognized as Jeeps by the average American.