Gas tank leaks

chhanes

Member
Rescuing the 51 Farmall M that I grew up on. Unfortunately, the second owner abandoned it to the elements for somewhere between 5-10 years. The gas tank had a lot of gunk in it, so I poured in a gallon of acetone to see what would dissolve. The only leaks were found when I turned it up onto the front side. These leaks are in the UPPER stamping on the front. I thought that was a bit strange. At any rate, I am asking for your experience to see how to fix this tank. It has zero dents although there is a fair amount of pitting on the (exterior) top side. Assuming that sealer would be adequate for the inside. I will have a body shop do the sheet metal, so media blast would likely be done. But is there a particular order in which repairs should be done? In this part of Ohio, tanks are hard to come by. Salvage yards are not carrying much of anything from Farmall Letter Series. Any advice would be greatly appreciated.
mvphoto92254.jpg
 
i would lean toward getting a different tank. check out bates corporation in bourbon indiana, large ih salvage yard and they ship or there is a
facebook group called farmall parts exchange. tons of used ih parts for sale.
 
If it's going to be much trouble at all to
even get it to hold gas, I think I'd just
bite the bullet and get a different tank.
Even if it means paying shipping to get it
from another state.

For what it's worth, most tanks are dent
free. That makes it fairly easy to find
good ones in salvage yards. Finding one
that isn't badly rusted, is about the only
thing there. Finding dent free hoods and
grills, is much harder to do than finding
dent free tanks.
 
If it's gas be sure to thoroughly air it out before having it media blasted. Even washing it out with acetone it would still contain enough
fumes to blow up. I usually will run an air hose in the tank at very low pressure for a day before I attempt to weld or sandblast a gas
tank. I would first treat the inside with phosphoric acid and rinse it out. When dry coat the inside with Red Kote. Then after the exterior
was blasted prime it with an epoxy primer. Then fill the holes with bondo and sand level. Then coat it with epoxy primer again followed by
a filler primer and paint. You should use a urethane paint on a tank. It would hold up to gas spills where many other kinds of paint would
lift from the alcohol content in the gas.
 
I had the same issue on a tank form a W6. Give it a good cleaning,
then take it to somewhere that specializes in gas tanks and they
can put a liner in it. Don't do one of the do-it-yourself liner
kits; they often start dissolving after 5-10 years and cause more
problems. The one on the W6 only cost me about $150 to get done.
That was 7 or 8 years ago, so I'm sure it would cost more now, but
still quite reasonable.
 
If your picture is the total area of leaks in the tank, can you cut it out and weld in a patch. then have a body shop prep and paint it? Seems like you could hammer out a patch with a little work, and fix the whole shebang. Or maybe cut a patch out of an old outboard motor gas tank. They have a lot of curves to choose from. steve
 
nearly all tanks are going to be rusting from the inside out, as this one is. So getting a replacement tank that does not need a
liner is slim and none. You are going to hear good and bad reports concerning the tank liners, ie red cote, Northern radiator
tank sealer, but fighting rust flaking into you fuel is not fun. a decision you will have to make. I've used a tank liner on a
couple rusty leaky tanks. A lot of prep work went into cleaning the tanks and preparing them, I am happy, but it has only been a
few years since I did it. gobble
 

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