My 58 Ranchero has a drain plug in the bottom of the gas tank. I have had a very small leak since I got the vehicle about two years ago.  I tried teflon tape, but I think the gasohol got to it. This weekend, I tried some gas tank sealer (two part epoxy putty), let it set up for 24 hrs, put in about 5 gals and it is already damp. Any other ideas?

I've had the same problem on my '55 for a long time. I have slowed it down at times but never got it stopped. I'm about ready to weld the SOB.



Hope somebody can help you (and me) with some suggestions.

Just call me 'Dick'

Dont weld it! Try draining the tank dry,then clean the drain plug threads with some brake cleaner.Then apply some red lock tight.

55 fairlane gasser 312 /c4, 57 f100 292/c4, 52 mainline gasser 302/t10 4speed

I've always had good luck using Permatex's "Formagasket"(the old school stuff that comes in the small white tube) Use the non-hardening (1B, I think) as a thread sealer- works every time... /Duck

BOO- YA!!!

I'm with Duck, worked for me, I put it on in the off season, by the time I gassed it up again, never a leak, been 9 years. Gary

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

OK, drained tank again and used Form-a-gasket non-hardening. It still leaks.  Is it possible I have the wrong gas cap?

Could the cap be pressurizing the tank?

Maybe its time to drain it and take it to a rad shop who fixs gas tanks.

  

That would be my final option, I'm just trying the cheaper options first.

Perhaps lightly rethreading and using a new plug.