WHAT IS THE VOLTAGES READING AT FUEL PUMP WHEN ...

  • Tiny
  • Anonymous
  • 1994 GMC Safari
  • 150,000 miles

What is the voltages reading at fuel pump when is running?

Friday, November 16th, 2012 AT 7:22 PM

1 Reply

  • Tiny
  • JDL
  • Expert
  • 16,289 posts

Probably around 13 and 1/2 volts. At key on, your systems get battery voltage. Engine running, the systems get alternator voltage. There is a difference.

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Friday, November 16th, 2012 AT 7:52 PM

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