Dave L
Question: Diagnose hard start.
2000 GMC K3500 5.7l
Fuel pressure checked at port.
Key on 55 psi for 2 seconds then drops to 0 .
Key off re-energizes pump 55psi for 2 seconds
Starts and runs well if cranked before pressure drop.
Why does pump energize when key switched to off?
Fuel pump check valve?
Pressure Regulator?
Bad ground?
Thank you,
Dave
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