96 GMC Sierra pickup 4.3 liter96 GMC Sierra pickup 4.3 liter

Asked by Jan 21, 2017 at 09:12 AM

Question type: Maintenance & Repair

My 96 GMC Sierra pickup 4.3 liter
will not start it has Sparks fuel
pump is brand new but injectors
are just not firing I changed out
the Spider injector and still the
same problem fuel pressure is still
good what might cause this from
not firing

1 Answer


Check engine light on? May be the crankshaft sensor, normally that is what goes first. If you have a scanner check for codes. Verify the fuel pressure, it should be 56 to 63 lbs. and do a bleed down test, just watch the fuel pressure gauge and see if it drops. Should not drop more than 5 lbs.

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