Voltage drop test for fuel pump help

Asked by Jun 03, 2017 at 01:58 PM about the 1998 Chevrolet C/K 1500 Silverado Extended Cab SB 4WD

Question type: Maintenance & Repair

I am having issue with my truck not starting. The fuel pump is less than a year
old but only runs 48 lbs of fuel pressure when cranking over. If I prime the
engine with pump it will start right up and then has 54 lbs of fuel pressure. I
dropped the tank and did a voltage drop test, the positive side had right at .52
volts but the ground side showed over 1 volt of drop. I read the .5 volts is ok. I
cleaned the ground wire to the frame and rechecked the voltage drop and it
remained the same. Now I am at a loss as to where to start looking to find
what is causing the voltage drop.

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