Thread: Gas Tank Leak

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I have a 1968 C-10 pick up truck. I can smell a a ags smell inside truck. I think I may have a small leak somewhere in the tank. It ofcource is inside truck behin seat. I will evevly buy a new tank or somthing. But I was wondering if anyone new of some sort of a sealer I could put on it. Maybe in a spray can because the leak may be up under tank at the floor. Anything like that out there? Also I do have a 1967 truck with a tank in it. I was going to use the tank in it. But caint seen to get it out where the filler tube is in the body. Afried to fourse it, I may damage the tube. So I left it alone. Just will get a new tank from Year One or somewhere. Thanks John.

I think O' Reilly's sells some kind of a putty designed to plug gass tank leaks, of course you would have t know where its coming from first. If I had to guess I'd start looking where the sending unit exits the tank. But the best thing to do is to drain the gas and remove the tank, find the problem before it decides to let go on the road. These things have a tendency to get dangerous at the most inopportune times.

it's probably the rubber filler tube leaking.

If you want a new tank, i've got one in great shape, I'll let it go cheap. just email me.

is this putty stuff meant to go on the outside of the tank?

Yeah. Its intended for an emergency repair. Out 4 wheeling and kick a rock into the tank sort of thing. Not your problem I know. The only other option I know of is some stuff that Eastwood sells or used to sell. Its a rubber that you dump in an swish around the inside. I don't know how it works, but the tank would have to come out anyway, so thats why I say get a new one. As I say I'd bet money its leaking from where the sending unit goes in. There a big rubber O-ring there and they get hard with this new gas we're using. Its easy to remove the sending unit.

Firebird77 has a good point. It could be leaking at the filler tube at the top of the tank. Thats where you stick the gas nozzle in to put gas in. Pull the seat back and check out that big rubber hose that you see there.

Also check the big rubber grommet where the filler pipe goes through the cab wall. If its cracked a little gas and a lot of stink can get in the cab when you fill up.

mine is leaking very slowly from a little section along a bottom seam. the leak is so slow that you can only even smell gas if you put your head right down next to the tank. No fuel even makes
it to the ground. But none the less it's a leak.
Now that there is fuel in it I can't just weld it up, so I was thinking
maybe fiberglass resin on the outside.

I used the stuff in the clear tube[2 part] that Oreillys sells on a leak in my gas tank 3 rears ago. Stopped it immediatly and is still not leaking today. It was a pinhole on the bottom of the tank. Joe

Originally posted by tcodi
mine is leaking very slowly from a little section along a bottom seam. the leak is so slow that you can only even smell gas if you put your head right down next to the tank. No fuel even makes
it to the ground. But none the less it's a leak.
Now that there is fuel in it I can't just weld it up, so I was thinking
maybe fiberglass resin on the outside.

Napa and others sells a special tank repair kit consisting of some special 2 part epoxy, a peice of fiberglass cloth, and a brush