Posted by JD Seller on November 09, 2019 at 06:03:30 from (208.126.198.213):
In Reply to: Skid steer fuel posted by Roger in Wisconsin on November 09, 2019 at 05:47:58:
The engine crankcase is sealed not vented on these type of engines. So as the pistons cycle they create a air pulse. The fuel pump has a diaphragm that contracts and expands with the pulses. This action when combines with check valves pumps the fuel.
So you can easily have a bad pump. You can check them by removing them form the fuel circuit and then putting a short hose on the air port. The using you mouth suck on the line creating a vacuum. Do this in a rhythmic manner and you should be able to feel vacuum on the inlet side of the fuel pump. Usually when they are bad you will be able to suck air straight through the pump.
On the motor side just hold your finger over the pulse line and crank the motor over. You should be able to feel the air pulsing in and out. If not than you have a crankcase leak.
P.S. I had a fellow that would complain his new mower would not start or run correctly. I went out and he had failed to tighten the oil dip stick. So the mower would run a few seconds on the fuel in the carb. and then die. He did this multiple times. He even called JDs service hot line complaining about our service department doing nothing. Got us a visit by the territory service manager. I had to show him how it would do that on a new mower that we had on the show room floor. Old fellow was so forgetful he could not remember how to do things but blamed everyone else for his troubles.
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