Mechanics

TROUBLESHOOTING

1987 GMC S15 • 6 cylinder 4WD Manual • 98,000 miles

Fuel pump on 87 gmc s15 troubleshooting
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Wykle42548
November 20, 2010.




Use a gage and check fuel pressure. Engine cranking, check voltage and ground for the fuel pump connector.
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JDL
Nov 20, 2010.
Just to add, there should be a fuel pump test connector, under the hood. Driverside fender lining. Tan wire with white tracer, electrical connector, nothing plugged into it. If you use a jumper wire with inline fuse to battery +, the pump should run, no need to use the key. In the diagram c8 is the test connector, #3 is the fuel pump relay.


JDL
Nov 20, 2010.

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