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Edited post above to state that when gas was overflowing out the gas cap during warm weather it would immediately stop once I popped the gas cap - but I guess that makes sense though... 
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The solution seems obvious -- convert to diesel.
TJK

Howdy! Is there room on the housing bottom where you could tap in a hose barb with a right angle fitting so it would introduce the vapors inside the filter element? JohnSo it looks like I have two solutions -
1) Buy a vented gas cap and see if that keeps the gas smell down (Thanks Kaderabek). How would this keep gas from expanding and over flowing out of the fill neck? Would the vented cap cause the tank not to overflow because the expanding vapor has somewhere to go? So - a vented cap would do the same thing as when I remove the non-vented cap to stop overflowing?
2) Buy a new sealed gas cap, install a charcoal canister from a FJ60 that I already have, run current line from tank into canister top, other top line back out to the air filter housing, and rear vented out to the current location in the passenger body mount under the A pillar.
I don't think #2 will work with my 76 air filter housing as I don't have a place to hook up the charcoal canister to the housing. I have a air filter housing from a 83 FJ60 (where the charcoal canister came from) but I would prefer not to use it as I've already stripped and repainted the original housing.
The solution seems obvious -- convert to diesel.
I had it overflow on me twice in hot weather and one time I got a face full of gas when I opened the cap at the gas station.
I'm thinking a vented cap might solve your entire problem. It's certainly the first thing to try..

Howdy! Is there room on the housing bottom where you could tap in a hose barb with a right angle fitting so it would introduce the vapors inside the filter element? John
Steve....you are lacking venting......had the same problem in the 74........the PO had plugged ALL the vents......you might check the "one way" valve part # 77701T that goes after the fuel air separator; it could be stuck or installed backwards.........ask me how I know it can be done....it can..........any similar charcoal canister will do HTH
Lou
I would love to drop in a diesel but I don't have the expertise to do that conversion and I have a 83 2F torn down and almost completely packed up and ready to go to the machine shop. I have to get this thing back on the road - its killing me!
I mentioned putting in a SM420 one day a few months ago while she was down and Trollhole about kicked my a$$..."no more delays!"
It gets hot in the UP of Michigan? I call BS!
There should be - I'll try that. Last night I looked to see how easy it would be to put my charcoal canister from a FJ60 in - that thing is huge! I would have to mount it on its side. If I mounted it upright it would poke through the top of the hood.
Will do - I already checked it but my "check" was a 'wiggle, wiggle' and 'OK, its there - check!' So air should be able to pass from the fuel air separator through the valve but not back into the fuel air separator - right?
Thanks!
Steve, I just take it out and blow on it.......should only let air go in one direction........I had installed it backwards when I replaced the hoses
Lou
...on the 74 the PO had removed charcoal canister...vent lines and stuck on a weber.......so I had no where to route the air-fuel separator unless I made up hard lines then placed the charcoal canister in the engine bay .......hook it up some way or another to the weber....took the dirty quick way out and till now no more gas leaking or smell HTH;
If I use a vented gas cap won't that still let gas leak out the cap when I'm leaning hard to driver?
I recommend over compensating. Worked for me.
TJK
All the girls ask me that....![]()
jkOr I can't tell.
Sounds like you better get to work!
(My wife never drove the 55. And my daughter eventually requested that I not take her to school in it anymore.)
Don't put that '83 water pump on, it's toast. Yes, the PO having sealed up the weep hole is indicative of a problem. Leakage from the weep hole is a sign of impending failure.
I don't know if the '76 would work. It's almost new, either use it or get a new proper one.
The sensors on the '83 thermostat housing are probably of no use to you - depends on how much smog equipment, etc you are using...