Fuel Tank Leaking

[dwainf]

Hello from Moose Jaw, Saskatchewan!

My 94 FZJ80 has picked up another annoying habit. When I fill it over half, I get a sizeable amount of gas leaking from the front of the tank. I have crawled underneath, but I can't see any damage or fuel lines in that area. Is there any sort of a vent that may be leaking, or is this a seam cracking. If I fill the tank halfway or less, no leak.

If its a crack, can it be repaired or is this a replacement issue?

Any ideas would be appreciated.

 

[Beowulf]

Any ideas would be appreciated.

I have zero experience with leaking gas tanks on the 80. However, I will offer some advice.

When you find the leak, don't weld on the tank in your garage.

-B-

 

[corbs]

Yeah, go outside when you weld the leak, it's much nicer. No one likes to be cooped up indoors. . .

 

[JerryLX450]

When you find the leak, don't weld on the tank in your garage.

-B-

Otherwise your neighbors will see beautiful fireworks and have celebrate the new year early than us

 

[dwainf]

If its a crack, welding it myself is not an option...there's something about flames and gas that makes me nervous!

Does anyone know if there is a vent tube or something that could be leaking?

 

[TCH2FLY]

If it is coming from the front I doubt it is a vent since there is nothing like that up front.
You can pull the second row seat and lift back the carpet. You will find the access panel to replace the fuel pump/sender. Remove that and you should be able to see any signs of leaks from that area.

 

[bjowett]

My buddy is replacing his tank. It has a leak in a weird spot up on top... I'll try to get a pic.

 

[cruiserland]

bjowett-
is the leak on the top at the front where the tank is formed to fit under the body?
it will happen again
I have replaced my tank 3 times, yes three times
due to a crack in the tank in the exact same place every time.
this spot does not touch anything, in fact I can slide my hand right in between the body and tank over the crack

toyota warranteed the last tank which lasted less than six months. they suggested replacing cap, which i did.

I filled the 80 up three days ago , and the fourth tank now has a crack in the same spot!
I think the tank is not getting air return while fuel is being pumped out, thus causing massive vaccuum inside tank; tank is collapsing and expanding with fill/empty cycle causing crack to form in thinnest part....

does anyone know what controls air return to tank?