The rear tank on my 96 4x4 may be leaking. I've smelled fumes since I've owned it but my MPG has been ok and there are no puddles or stains on or near the tank. I have a brand new tank on the front. I have a 90 2wd truck for parts, it has a rear tank only and it's also a 5.0, will this fit my 96? It looks like it's in good shape so I'd like to save some dough if it will fit.

 

I bet your tank is rusted on the top near the straps.

Mine was

 

My rear tank leaks slightly when its full, I was wondering if there is anyway to fix it without buying a new tank?

 

I guess I'll have to drop it and have a look. I don't smell gas all the time, it's just a wiff here and there. I can fill it up with no leaks visable. When I bought the truck it had a brand new front tank...bonus....LOL

 

Probably, but it's not worth it. Motorcyclists often have this problem, but the tanks are relatively more expensive, smaller and more accessible. The product to fix minor rust and pinholes is called Kreem (as far as I recall) and is commonly available at motorcycle shops, and perhaps some auto parts stores. First you have to get it clean so the stuff will stick, then you seal it.

A truck tank will take a lot. Plus, you still have to get the tank out of the truck. By that point (it's not cheap stuff) you might as well replace the tank, preferably with a plastic one that won't be able to rust out.

Possible exception - if you actally have a hole, not rust out (as is common) there's some sort of snot the off-road folks use that sticks well despite gas - but not so well to rust, and a rusty tank, if plugged one place will soon enough rust out somewhere else.

My Dumb Question (since I ought to go ask it at the parts place but have not yet) - are the seal rings on the gas caps easily available without a gas cap inside them? Mine are a bit dubious, but the caps are fine.