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Allis 170

N

Nzak

Member
I have 2 tractors both 170.
One I'm having trouble with gas running out of the carb.
I have rebuilt it three times with three kits still floods.
So I took the carb off the good running one and installed it on the one that floods. Or I'm thinking something else is wrong because that one flooded two. So removed it and installed it back to the running one everything good.
Anyone know what else to look for can't be the carb.
 
If by chance it's a Marvel Schebler carb, I have best luck setting the float to body gap to 5/16 inch instead of the 1/4 inch specs call for with today's gas. Have also seen the float brass valve seat gasket seep gas past it unless it's really tight.
 
Could it be that you have some dirt or fine debri ( rust) in one tractor fuel tank that you don't have in the other? Does the leaking tractor have more fuel in the tank ( more weight and more pressure on needle and float)?
 
I can blow in the carb fuel inlet no air passes with carb upside down. And right side up air passes
 
I went with an electric shutoff on three of my gas tractors. I hooked them to the coil so as soon as I turn on the switch,they open up and let the gas flow. Shut them off and the gas stops. Works great.


cvphoto42170.jpg


cvphoto42171.jpg
 
Amazon. Just search it on there. I think the one in the picture is actually from a nitrous kit,but I got the other two off Amazon. An auto parts store should have a whole catalog full of them too.
 
If there is a leak in the fuel line to carb. Would this cause the gas to keep flowing into the carb. Because of the air pressure
 
No. The only way gas can run out of a carb when sitting (assuming the float doesn't sink and is adjusted properly) is if the needle isn't seating, or the housing is cracked around the seat threads.
AaronSEIA
 
Very few people have a correct tool for tightening the brass seat into the carbs upper body. A normal sized screwdriver doesn't work. I have an old putty knife that I reshaped and sharpened to fit the seat notches good and be able to use a pair of pliers to make sure it is tight. I also think you have a dirty fuel tank that needs to be cleaned out and them graft in a paper in-line fuel filter from a car to catch remaining debris and keep out of carb. Shutting off the valve at the sediment bowl when not using the tractor will prevent gas running thru the carb, although that valve isn't easy to reach on an old One-Seventy.
 
(quoted from post at 02:57:04 11/17/19) I have 2 tractors both 170.
One I'm having trouble with gas running out of the carb.
I have rebuilt it three times with three kits still floods.
So I took the carb off the good running one and installed it on the one that floods. Or I'm thinking something else is wrong because that one flooded two. So removed it and installed it back to the running one everything good.
Anyone know what else to look for can't be the carb.
Click to expand...
Okay found the PROBLEM......
Loose connection from carburetor to fuel bowl.
Tied everything real tied and no fuel leaking out of carburetor.
 
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