656 gas tank leak

Wicksfield · Sep 6, 2017

I have a slight dampness where the fuel bowl strainer screws into the tank. It appears that it's not leaking at the strainer
threads but at the fitting that the strainer screws into. I assume this fitting is welded/brazed to the tank and has developed a
slight crack over the years. Can I buy something to repair the leak or am I going to have to pull the tank and have the fitting
re-brazed? Again, not a leak with a drip, just damp.

rustyfarmall · Sep 6, 2017

It is very possible that it is the threads that are leaking, and the moisture is migrating. I guess it is also possible that the tank DOES have a crack, but I think I would drain the tank, remove the sediment bowl and then wrap the threads with teflon tape and reinstall. You might get lucky.

Wicksfield · Sep 6, 2017

I hope you're right. I just went out and cut two narrow strips of paper towel. To isolate the problem, I zip tied one around the
fitting and the other around the exposed threads of the strainer. We'll see which one is damp in the morning.

Thanks for your response.

2002sliverado · Sep 6, 2017

I would give the Teflon tape a try, too. That might just solve the issue and it costs you about nothing other than some time and effort.

K-Mo · Sep 7, 2017

I had a sediment bowl fitting crack on an old Cub Cadet fuel tank. I drilled a hole through the crack and installed a pop-rivet to stabilize the crack. Then sealed it with JB Weld.
Same story on an IH 140. Crack at tank baffle spot weld. Drilled a hold through the spot weld crack, installed a truss head bolt and sealed with JB Weld.
Previous JB fixes never held until I stabilized the crack.
Both have held for years.

OldFarmall450 · Sep 7, 2017

I've seen some pretty surprising repairs made with JB Weld and ingenuity. Dad had a truck with a leaking gas tank. He put up with it a while, then tried JB Weld. It promptly fell off. Then he let the tank get almost empty, roughed up the spot, then cut a piece of burlap sack and used it with JB Weld. It held for years until he scrapped out the truck.
It's worth a try if it isn't the threads.

George 3 · Sep 7, 2017

-------------------------------------------
I have a 656 Farmall that had the identical problem. It was loose enough in the threads that you could feel it. All we did is disconnect the outlet tube to the carburettor and rotated the whole strainer assy one full turn. That tightened the threads nicely and it never leaked again.

Wshowalter · Sep 7, 2017

Seal-All is best sealer I have found for gas leaks. 2 ounce tube is $6 at most any auto parts. Good luck.

656 gas tank leak

Wicksfield

Member

rustyfarmall

Well-known Member

Wicksfield

Member

2002sliverado

Member

K-Mo

Member

OldFarmall450

Member

George 3

Member

Wshowalter

New User

Similar threads