1987 Chevy Blazer Fuel Pump not working

Tiny
TRAVTODD
  • MEMBER
  • 1987 CHEVROLET BLAZER
  • V8
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
I am not sure what else to check before dropping the tank and replacing the pump. I have power to the 2-wire plug before the pump (on frame rail above rear axle) I do not understand why I am getting 10 volts on tan wire (relay side) when the plug is apart and 0 when its together? I also get 10 on pink wire (relay side), but I only get 5 when plug is connected (5 also on pump side - purple wire)
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Tuesday, March 2nd, 2010 AT 2:28 AM

1 Reply

Tiny
CARADIODOC
  • EXPERT
Hi travtodd.

A real common problem if you live in a road salt state is lack of a good ground on the tank. Use a good, reliable body ground for your voltmeter, then with the positive probe, scratch a good connection on the tank. If you find voltage there, drill a hole in the flange by the seam and run a self-tapping screw in there for a new ground wire. Be sure the hole is well outside the weld.

Caradiodoc
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Tuesday, March 2nd, 2010 AT 6:12 AM

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