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Gas tank

I've never personally tried.

There are mixed reviews, some swear by it, others promise failure.

I think it has a lot to do with successfully cleaning and prepping the inside. Still I can't see anything working over severely flaking rust. Just my opinion though.

My recommendation would be to replace the tank if it is available. I've also seen the original tank cut open and a small fuel cell hidden inside. Great for parade tractors!
 

I know of many who have used a product called POR . It seems that it can work if the tank only has a few pinholes and very little flaking rust . Long term success rate seems to be about 2 in ten though .
 
I have. I had a leak on the bottom of a Farmall B tank, right where the spot welds hold the mounting bracket to the tank. I think a spot weld pulled out on it.

I used gas tank repair epoxy around the mounting bracket, and used a one part gas tank sealer inside the tank. That was in 1998 and so far so good. No leaks yet. I followed the instructions to the letter.

The only advice I can give is that it cannot be too clean before you use the sealer.
Clean it, clean it again, then clean it again.

The stuff I used was this:
The Shop Gas Tank Sealer
 
NAPA sells a liquid tank sealer. I am thinking it is made by Permatex that is good. Put some in a tank on a TE-20 back about 1980 and its still holding up.

Whichever you choose to use. Be sure to remove the petcock or fuel line fitting from the tank and don't set the tank in a way that the sealer will pool around the fitting. Also be careful not to get the sealer in the threads or tabs on the tank or fuel cap. For once it sets up. It forms a thick layer of plastic like liner. Which is difficult to remove from unwanted places.
 
I was lucky to buy a new tank for Jubilee off of YT! Big thanks to YT!!!
Wasn't that much difference between repairing or buying new.
 
I POR 15 all of my restorations. If you follow the instructions to the letter it works very well. You have to get ALL of the loose rust out of the tank and it has to be CLEAN. I can't stress those two things enough. Take a couple of pounds of flat washers, put them in the tank and shake it in all directions. Fill the tank with the tank cleaner and repeat the shaking. Shake until your arms are dead. I have hung large tanks on my chain hoist A frame and done the shaking if the tank is large. I usually do the cleaning process twice. Once it is clean and etched make sure it's completely dry. Done right POR 15 works great.

OTJ
 

Don't keep busting your arms shaking tanks OTJ.
Next time wrap the tank in a blanket and put it in a concrete mixer to shake the washers about . If it's too big for that strap it to a rear tractor wheel and go for a drive around a nice flat paddock .
 
What kind of tank? If it's plastic and going bad from age there isn't much hope. I've cleaned out a number of gas tanks and welded larger holes and then lined the inside with Red Kote. I had a riding mower once I had to cut the entire bottom out of the tank and fabricate a piece of sheet metal and weld it in. Then coated it with Red Kote. A plastic tank if it's leaking from damage you could do some plastic welding on it and then melt in some plastic with a heat gun to seal it better. I don't believe a tank liner would adhere to a plastic tank.
 
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