Carbs flooding

grandpa Love · Sep 1, 2020

Got an interesting issue on several tractors. A cub. A farmall M. A Massey 204 and a Ford 951. When I turn the gas on it fills up the carb and runs out around the air breather hose. Never had this issue on any tractor before. I have been using regular gas. Maybe I better start getting 100% gas?? 2 carbs have new rebuild kits in them. One was cleaned and put back together and one we ain't never had to fool with. Any ideas? Worst part????? On the 951 gas poured out and ran over my oil filter housing and frame rail . ....my freshly painted tractor!!! Grrrrrrr.

dzc3 · Sep 1, 2020

If any piece of crud found its way into the carb it could prevent the needle from closing 100% I would start there.

47fivewindow · Sep 1, 2020

When we fool with these old girls that haven't been run in a while, tiny pieces of dirt or rust manage to make their way down the pipe and lodge in the needle valve. Unfortunately it is part of the fun. Shut the fuel off, drain the carb bowl so the float falls all the way down, put the plug back in, and turn the fuel back on, and hope it flushes the dirt through the needle. Make sure the sediment bowl still has its screen. I got one of those bulb siphon things and use it to vacuum the rust flakes off the bottom of the tank every time they give me grief.

504 · Sep 1, 2020

The needle is sticking in the seat because there is not enough clearance in the china parts and build up from the ethanol. I polish the three points of the needles by putting emery cloth on a flat surface, and try to keep my finger nails out of the way. New or rebuilding I do them all.

47fivewindow · Sep 1, 2020

I believe you brush paint. If you mix in TSC hardener it will make it resistant to fuel spills and you wouldn't have to worry about getting the paint in your lungs. When it is sprayed without precautions it can be harmful.

old · Sep 1, 2020

Could be one of a number of thing or a combo.
#1 you didn't put a set in the rubber end of the new needle
#2 you did not get the new needle seat is as tight as it should be and it is leaking around the gasket.
#3 you have some dirt/rust in the needle seat area.
#4 the float is hanging up in the float bowl due to being bent out of shape
#5 float is not set right

David G · Sep 1, 2020

Agreed

Ron Muhlenkamp · Sep 1, 2020

My floats were hanging up on ethanol fuel in my Fords, 800, 900, and 4000.
I cleaned the float jets and now shut the fuel off and run the carb dry at every day end.
Solved the problem.

Steve@Advance · Sep 1, 2020

That's the nature of the beast with an updraft carb.

The problem is almost always trash coming down the fuel line. It only takes a microscopic chunk of rust to hold the needle off the seat, or even damage the rubber on the needle.

Try closing the tank valve, pull the drain plug on the carb and let the gas drain out of the bowl. Then open the tank valve. While gas is flushing through the carb, tap on the carb wit a plastic screwdriver handle. That will usually clean out anything that has caught up in the valve.

If the tank is flaking rust, or contaminated expect a repeat performance...

gab · Sep 1, 2020

I've seen two kits from Farm/Fleet ( A and I kits I think), one didn't have the seat machined and the needle was too big to fit in the other seat.

M-MAN · Sep 2, 2020

Pour some seafoam or mechanic in a bottle in the tank and run them. My M did that back in the spring. I dumped half a bottle in it and it was fine an hour later.

Metal Man · Sep 2, 2020

Having the same problem with my 641 I just rebuilt. It ran good> I haven't had a chance to work it but would
start it once and a while and let it run. Yesterday I had trouble starting it and gas run out the carb.
but only run a couple minutes and died.Going to pull it off and check things out again. New needle wanted
to hang up in the seat. This is good information here. Good lock Grandpa.

Mike M · Sep 2, 2020

I don't think anyone mentioned about the float could have a leak in it too.

Carbs flooding

grandpa Love

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dzc3

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47fivewindow

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504

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47fivewindow

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old

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David G

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Ron Muhlenkamp

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Steve@Advance

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gab

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M-MAN

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Metal Man

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Mike M

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