Join Date: Jul 2013
Location: Sacramento, CA
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Fuel Rail or Fuel Bowl Losing Prime
I have recently replaced the fuel lift pump on my 99 F350 7.3L. Shortly after replacing it, I began to hear knocking in the injectors. For some reason, the fuel system was taking on air. To rule out the possibility of a leak in the fuel line(s) or connections, I ran a direct 3/8 inch fuel line from the tank to the pump and another one from the pump to the fuel bowl. I started the engine, it idled fine for a minute, the knocking sound came back and even stronger, and the engine stalled.
I'm guessing the fuel rail or fuel bowl lost its prime. I turned the fuel bowl's pressure release valve and turned the key. Fuel did begin to spill out, so I'm guessing the air has been purged from the fuel bowl. If that is the case, is it likely for the fuel rail to have lost its prime? If so, how to I prime it?
When I crank the engine, it appears to want to start but doesn't quite make it. There is some combustion occurring but probably lacking enough fuel to start the engine.
Thanks in advance for any help...