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860 Fuel Starvation

B

Brian Saylor

New User
I have a '55 860. Runs great 99% of the time. When it really counts, it seems to starve for fuel and shut off. If you wait 20 seconds and restart, it runs for 1 minute. If you wait 10 minutes, then it runs for 20 minutes. I cannot determine if the float isn't supplying enough fuel into the bowl or if the line from the tank is not. I take off the line from the sediment to the tank and it flows fine. I can shoot air into the line and it doesn't fix the problem. I bang on the side of the carb bowl and nothing gets fixed. The carb is rebuilt and has all new jets, valves, etc. This only occurs when running at 1800 RPM or greater. If I run at 1200 rpm, it will run all day long. But not fast enough for a mower.
 
try this test. get a clean bucket. remove line from carb and let pee in the bucket. watch it pee for 20m.. if it never stops.. then dump gas back in tank and do the same from bottom of the carb.

from what you have said sounds like either a stuck or heavy float or a dirty needle / seat not keeping up with flow needs

soundguy
 
When you run it hard you create heat. Is your heat shield installed between the muffler and fuel tank? Does your fuel line run straight down from the tank to the sediment bowl or has it been re-routed around the manifold?
 
Have you tried to run it with the gas cap off?? It could have a clogged tank vent and that will cause funny problems and or do you have the heat shield under the tank hot gas boils and that again can cause a funny problem. Not as likely but a over heating coil can cause funny problems also. A coil should be warm to the touch but not so hot you can not hold on to it
 
I don't know about the fuel line being heated but worth a shot. My last time that it puked out was about 3 weeks ago when the temperature was 12F. I was plowing snow.
 

Just a thought, but electrical problems can also shut off the engine. Bad ignition switch or a short at the distributor would do it too.
 
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