Posted by michael price on December 20, 2018 at 16:22:50 from (50.108.98.210):
Im having trouble with my JD 4400 diesel combine and Im hoping someone here can help. It will fire right up and run good for about 15 minutes, then its starts to slowly loose rpm and will eventually sputter out. You can let it sit a minute and fire it back up and it will run fine but do it again.
I seem to be getting plenty of fuel to the injection pump. So far Ive cleaned the screen in the sediment bowl, put in a new fuel filter and even checked the screen inside the injection pump. There is a electric pump under the tank and a mechanical pump on the engine. I pulled the fuel line off going to the injection pump and it has lots of fuel flowing out with the electric pump going. I even blew air up into the tank thinking maybe something was plugging it on the inside.
But tonight I found a fuel leak but it was fuel leaking from the injector return that runs back to the tank. It was leaking with the engine off but the electric fuel pump going. Should the electric fuel pump be pumping through the injection pump and back through the injector return line to the tank?
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