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), 700R4, D20
-'74 D44 front (nonpower discs)
-custom headliner
-Front shoulder belts (rears eventually)
viewtopic.php?t=23070
Dec 1962 Panel Delivery
Woods Find
All Original 4x4