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air in fuel system

M

morgan in ar

Member
A customer has a deere 320-A that was running poorly, losing power, dying, but restarting fine. I replaced his fuel filter, and it runs good, but if you shut it down it won't restart unless you bleed the fuel line to the injector pump. It is getting good fuel flow at the injector pump. I can see an air bubble from in the glass bowl on the lift pump while it is running. I am thinking there is a cracked fuel line before the lift pump, maybe bad gasket on the lift pump bowl. What do you all think?
 
I am not sure what JD your working on as the models is not familiar.

You are getting air bubbles into the inlet side of the injection pump. Put a clear line on that side and see if your getting air bubbles. When you shut it off the air bubbles are raising and collecting in the filter and injection pump.

Check all the lines and fittings back to the tank. Including the fuel pickup in the tank. An air leak many times will not leak fuel but will allow a vacuum to draw in air.

I fought this on my Dodge pickup for almost six months. It was a small rust hole in the suction fuel line. It would not leak fuel but would suck air.
 
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