1991 GMC Sierra p/u


Asked by Mar 15, 2016 at 10:57 PM about the 1991 GMC Sierra 1500 K1500 4WD Standard Cab SB

Question type: Maintenance & Repair

Can someone please help, my pick up is not
passing spark. We replaced the fuel pump, fuel pp
relay and distrubitor. But the fuel pump is not
coming on. It's not pssai g spark to the injectors.
I'm not sure what else to do.

1 Answer


Check see if you have power to fuel pump. When turning key on the relay clicks and sends power to fuel pump for roughly ( seconds to build up the lines with fuel until lying turn it on. If so then your fuel pump is toast. Very common on these models.

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