Will an 01 Silverado 6 liter engine provide spark if the fuel pump is defective

Asked by Sep 29, 2015 at 07:15 PM about the 2001 Chevrolet Silverado 2500HD

Question type: Maintenance & Repair

Will 6 liter Vortec engine provide spark if fuel pump
is defective hooked up timing light to spark plug wire
did not get a light

5 Answers


If you are sure the fuel pump relay is working, check continuity from the pump to the relay socket. These wires love to corrode. When you turn your ignition on, the fuel pump will only run for a couple seconds before it shuts off via the automatic shutdown relay. Make sure you are checking power within this window. The PCM (powertrain control module) is what completes the ground in order for the relay to send power to the pump. If the PCM does not receive a signal from several sensors (mainly the Crank Sensor) it will not turn on the pump. You may want to check these sensors, is the check engine light on? You can scan it to see if any sensors have thrown a code. Be sure all applicable fuses are ok, the PCM may have its own fuse, check that even if the fuel pump fuse is ok. Your Truck may also have an inertia switch for the fuel pump which shuts it off during an accident. Check that as well.

Not sure about relay. Truck was running perfect shut it down and hour later wouldn't start


Rule out the obvious first. There are too many items to check narrow it down. Do you have any silly lights/warning lights on truck or key security light on? Then check to see why you have no spark/current going to plugs and fuel..? All these are vital to starting car

1 of 1 people found this helpful.

No there are no warning lights or other warning symbols I'm going to check fuel pump relay in the morning if I prove it to be bad fuel pump which I'm leaning toward debating on whether to pull my bed off or drop the tank


Had the same problem. Tried everything even grounding but nothing worked. As I researched other potential causes I found that the security system was possibly my problem. We changed the security switch in the steering column. Has worked perfectly ever since.

1 of 1 people found this helpful.

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