5.9 Cummins fuel problem
We have a 1998 HR Endeavor with the 5.9L Cummins. Last summer a problem developed which drove my mechanic crazy. Engine would start then die. He replaced the lift pump and everything seemed fine for a...
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Info from my mechanic after looking at the serial number up:
OK it is what I thought it was. I would have the voltage tested at the lift pump with the lift pump and engine running. Unfortunately if it is low the correct way to fix it would be to replace the ECM. The cheap way to fix it is supply the lift pump key switch power. That is only 12 volts in the run position. You do not want the 12 volts to stay on during the cranking position of the key cycle. It sounds funny to not want 12 volts to it but VP44 injection pumps don't like fuel pressure when they are trying to start. After the start the don't like having less then 10 psi supply pressure.
OK it is what I thought it was. I would have the voltage tested at the lift pump with the lift pump and engine running. Unfortunately if it is low the correct way to fix it would be to replace the ECM. The cheap way to fix it is supply the lift pump key switch power. That is only 12 volts in the run position. You do not want the 12 volts to stay on during the cranking position of the key cycle. It sounds funny to not want 12 volts to it but VP44 injection pumps don't like fuel pressure when they are trying to start. After the start the don't like having less then 10 psi supply pressure.
