Ok, at 4$ + per gallon I can't ignore this any more. I have a gas tank that leaks when I turn to the right and it is more than half full. The filler tube is my suspect since it is on that side. When I tackle this job I would only be too happy to find that the overflow tube or filler tube has a crack in it after 26 years of service. However I have to drop the tank out to inspect it and when I do I want to be ready for anything....short of buying a new tank in advance. My main concern is that the upper surface of the tank is hidden from view/inspection unless you remove it from the car. So once I have effected a repair on the leak I do not want take it apart again in the near future.
If I find some surface rust how should I procede? I know enough to fill the tank with water and leave it. But then what do you folks suggest as a way to seal it up.
I could sand off the surface rust and use fiberglass as an outer skin if really pretty pitted. A good priming with Rustoleum rusty metal primer is a thought if the rust is not so deep. I could follow that by a spray of some rustproofing type tar.
Unlikely because of how the leak presents itself but if I should find a hole or seam the is leaking what sort of "epoxy" do you find works best. Yes I do weld but I am a self taught stick only kind of guy. I'll repair your utility trailer but much under an eigth of an inch thick and I burn nice big holes in it. This plus the obvious explosion hazzards and my blood pressure would skyrocket so high I wouldn't be able to focus my eyes anyhow.
For the record the beloved car is a 1983 Mazda RX-7 so replacement parts are pretty tough to find...and expensive. It has a recess in it's upper surface that allows for the spare tire to be stored or I would consider a simple replacement tank.