I have a sumped gas tank that has a lot of welding time put into it and a small patch of rust is seeping gas steadily from it. Will a motorcycle type tank sealer work and possibly por 15 the outside?? I do not want to scrap tank yet. I saw a por 15 tank sealer product also, anyone have experience with it?? I know someone has been through this before...
Caleb

Well, I wont be a whole lot of help because I dont remember the names of products that I used. I had a hole in a tank that I put some sort of liquid sealer inside, probably similar too the por 15 stuff. the stuff I used had a couple of different things too put in, maybe one was a cleaner/prep and the other was the sealer. After I did that I put some 2 part putty on the outside that is made for gas tanks. My local parts store kept the putty sealer and they usually dont have much so I would guess it is fairly common. I might not have needed both products but I felt better that way and it has not leaked for a year.

The Eastwood company makes a sealer kit. www.eastwoodco.com (http://www.eastwoodco.com)

http://www.eastwoodco.com/images/us//local/products/thumb/p9152B.jpg

bud just goto your local hardware store and ask em for some QUICKSTEEL its a in a little tube and u just sqezze it and stuff like playdought and get it rubed up for about 25 secs and stick in on the hole and then let it dry for about 5 mins and your done...... we do it all the time for log truck disel tanks and a small crack on a radiator and stuff like that itll seal it up and the name says it all QUICKSTEEL graemlins/beers.gif graemlins/thumbsup.gif

I also had a pinhole leak after sumping my gas tank. I used the eastwood kit shown. Its a PITA but does work. If you can find something easier, try it.

I think the key here is he says that he has a "sump" welded to his tank. The tanks have a very high nickel content in their metal composition and are difficult to weld. You usually end up with a lot of porus "catepiller" that needs to be sealed from the inside.

My aluminum fuel cell was leaking around one of the welds where it mounts. I went to AZ, got this fuel tank sealer. It's like a round and about as long as a pepermint stick, It's a two part substance. I unwrapped, kneaded it together, applied it around the weld, after cleaning with acetone, it was hard when I ck'd it a couple of hours later. The tank is not leaking. This same sealer was also used in an episode of monster garage, when sealing a tank that this over confident welder had welded. Oh well that was a bit of trivia.

Patrick,
That was a great episode. Jesse made the guy sweat a bit before he gave hime the tube.

"Are you questioning my welding ability?"

Yea, the welder learned something, that all of us learn sooner or later, we all make mistakes.
See Ya!

Any rad shop will be able to seal it for you. They will coat the interior with an epoxy like product, similar to the por15 stuff.

I will try a radiator shop first and if no one can hook it up, I will go with either eastwood or por 15 sealer and finish the outside with por 15 also. Thanks for everyone's help and advice.
Caleb