Sometimes it cranks but does start

1999 GMC SUBURBAN
300,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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RREESE8520
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I have a problem of cranking but no start. I have traced it to the fuel pump as it was building no pressure. I replaced tank, fuel pump, fuller neck, fuel filter, fuel pump relay, crankshaft sensor, coil, distributor cap and button, wires plugs, and mass air flow sensor. sometimes it cranks right up then ten minutes later nothing with no fuel pressure again.
Feb 28, 2018 at 11:55 AM
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STRAILER
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Hello,

Did you update the connector at the fuel pump? They had a problem with these connectors. Can you verify the fuel pump relay clicks when the ignition key is in the on position please?

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Mar 2, 2018 at 10:21 AM