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Power Strokes
6.4 Tech
LPFP not cycling
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[QUOTE="MT_Diesel, post: 1442531, member: 10422"] I direct connected a battery to the pump and the pump works fine. Replaced the fuse even though it looked good and took the relay out and actually tested it. Relay functions as it should. So now it looks like a harness problem. Anyone know of a problematic spot in the harness that would cause no voltage to the pump? If not, I'll just start tracing and testing the circuit. I'm thinking it was fortunate the truck died while idling instead of while running down the highway since it essentially ran itself dry. Am I going to need to purge air bubbles out of the high pressure system in addition to the low pressure system? Is it possible (or even likely) that I did damage to the injection pumps? Thanks for any input. [/QUOTE]
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