Super M carburetor leak

ho0sier1953 · May 2, 2015

I'm new to this forum, so if I'm not where I need for this question, please someone direct me. My Super M just began leaking from the very bottom of the carb. Looking in a mirror, I could see the drop of gas form then fall. The 1/2" area it's coming from is recessed maybe 1/8", circular with a 1/32" hole in the middle. At first I thought an allen wrench would fit in the hole but it too is circular. It doesn't appear anything has broken off, but I'm wondering if I've lost some sort of plug - the area doesn't appear to be threaded, though. The fuel comes out at a pretty steady drip. All dimensions above are approximate. Any help would be greatly appreciated. Thanks.

rustyfarmall · May 2, 2015

(quoted from post at 08:47:25 05/02/15) I'm new to this forum, so if I'm not where I need for this question, please someone direct me. My Super M just began leaking from the very bottom of the carb. Looking in a mirror, I could see the drop of gas form then fall. The 1/2" area it's coming from is recessed maybe 1/8", circular with a 1/32" hole in the middle. At first I thought an allen wrench would fit in the hole but it too is circular. It doesn't appear anything has broken off, but I'm wondering if I've lost some sort of plug - the area doesn't appear to be threaded, though. The fuel comes out at a pretty steady drip. All dimensions above are approximate. Any help would be greatly appreciated. Thanks.

That hole is a drain hole. It serves to allow condensation to escape. If gasoline is dripping from it, there is an internal problem. Most likely the float valve is not stopping the flow of gasoline, or the float itself is either out of adjustment or has become compromised in some way. Carburetors are NOT simple, but neither are they difficult to work on if you have previous mechanical experience and some basic tools.

ho0sier1953 · May 2, 2015

MUCH appreciate your help!

Goose · May 2, 2015

I second that. More likely a float or sticking float valve problem.

Floats can be frustrating. I recently boiled the carb on my M and set the float to exactly what the manual said. It dripped constantly. I took the carb apart again and set the float level an eighth of an inch lower than what the book said and it's been fine ever since.

guido · May 2, 2015

Hello Ho0sier2063,

I second the float or needle and seat. If you take the float out you will see that is probably full of gas,
If it is a Stromberg carburetor, a float from a marvel carburetor may work, if you can't find one

Guido.

rustyfarmall · May 2, 2015

(quoted from post at 11:29:20 05/02/15) Hello Ho0sier2063,

I second the float or needle and seat. If you take the float out you will see that is probably full of gas,
If it is a Stromberg carburetor, a float from a marvel carburetor may work, if you can't find one

Guido.

International Harvester had their own carburetors. The Farmall M, Super H, and on up to the 656 and 706 gassers all used the basic, same design. All of the internal parts are readily available just about anywhere you want to look.

Super M carburetor leak

ho0sier1953

New User

rustyfarmall

Well-known Member

ho0sier1953

New User

Goose

Well-known Member

guido

Well-known Member

rustyfarmall

Well-known Member

Similar threads