should the voltage at fuel pump grey wire always read 12volts or drop to 5volts after a few seconds after key is turned on?


Asked by May 21, 2015 at 07:03 PM about the 1998 Chevrolet C/K 1500 Cheyenne Standard Cab LB

Question type: Maintenance & Repair

4 Answers


If the gray wire has 12 volts,and then drop,s to 5 volt,s,may be check the fuel relay,or the pump,could be locked up causing the drop in voltage.


has new relay.....


Can you hear pump when you turn key?


is very quiet, i tested 12 volts at fuse panel & now 12 volts at harness dropping to 8 volts under same conditions as first stated above, it is also the second brand new fuel pump. I'm starting to wonder if the grey wire to the pump harness needs replacing from fuse panel to harness. I'm going to check the continuity on it first

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