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gonzo 1066

2007 Cummins hard start question

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I have a friends 2007 Dodge Cummins in the shop.  The fuel lift pump does not always come on,  Is this most likely a pump problem or a switch problem.. First thing to look at?               It only starts hard when the pump does not come on.

Edited by gonzo 1066

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If you can tap the pump wire and mount a light or something to show you when the pump circuit is getting juice you would know. Definitely something you want to fix because that's really hard on the CP3

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One of the flash to my ECM,  cut the power to the pump during startup cycle.  power up and then drop to zero

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