I was wondering if any of the gas tank sealers that you can pour in a gas tank to seal a small leak work?
does it last a long time?

Used the POR15 kit in my 65.That was probally 15 years ago.I had a small hole that I soldered and then sealed the tank.It was nasty inside also as the gas was 10 years old and clumped out.I just followed the instructions and let it sit in the 80 degree sun for a few days after I sealed it.Looked better than new.Still there and no problems.My kid had his work car stolen.they punched a hole to drain the gas in the bottom.I cleaned it JB weld and a flat screw.Let it dry then a thin piece of sheet metal and more JB weld.Its been on there for 2 years and still dry.Rocky

I used por15 on my tank. It had a hole rusted in one corner that required a patch 3" in diameter. I brazed the patch and then did the por15. Been about two years and I don't see any crud in the inline fuel filter and my sender pickup filter is history. just an open tube until I get it replaced.

Just don't use the older orange colored tank sealers, they get dissolved by the alcohol in modern gasoline.

The POR-15 kit....
Does that use just the standard POR-15, or a special formulation for tanks?

The POR15 kit is made just for tanks.When I bought mine it was around 30 bucks.You do have to follow the directios.Tanks werent avaliable when I did mine.That and 30 bucks was cheap.Rocky

i was looking at the por 15 stuff. i had to weld on my tank to put an electric fuel pump in it, and thought that sealing it would be good insurance as long as the stuff dosent come off the tank and clog stuff up.

the POR-15 kit is great. I have used it on four gas and diesel tanks and never had a problem with it coming off or dissolving, or any rust ever again.
Two of them I did over 10 years ago and they're still perfect inside.
It is absolutely mandatory that you follow the instructions to the letter - especially the part about the tank being BONE DRY inside after cleaning. You can't do the whole job in a morning. I duct-tape an old hair dryer to the filler neck and let it blow on low heat for half a day.

Like I said I let mine sit in the 80 to 90 degree sun for like 3 days so I knew it would be dry.Then I let the sealer do the same thing.It works well if you follow the directions.Rocky

Another vote for the POR 15 kit, it is great. Not at all like there regular paint, it seams much more aggressive. 3 years now, '75 Vega tank found in junkyard, welded small hole at seam, then used the kit. Still looks like I just did it inside, and it still runs great. And no puddles underneath!

thanks for the info. i ordered the por 15 kit with the marine cleaner, metal etching stuff and the sealer. also printed the directions off of their web site so i could make sure i got it right.

Do yourself a favor, dump the whole pint of POR 15 in when you are ready. You will think it is too much, but there is a good reason........the leftovers will dry not matter what you do to try sealing the can. I had a little left twice, and tried to save it........it must start activating when the air hits it. It was rock hard in a day. Love the stuff, but it is a little scary, and God help you if it dries on good clothing.........

Here is my little Vega tank, with the tank sealer on the inside, and regular gray POR 15 on the outside. Still looks like this in the car, after 3 years or so.

I had a small pin hole leak in my 64 Dodge, so I just went to NAPA and bought the epoxy gas tank repair stuff. That's the stuff you cut off a pieces and work it together for a minute or so, clean off the paint and stick it on. I applied it to the outside of the tank with gas still in the tank and it worked! Seems hokey but it worked.