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If the ecm doesn't see oil pressure after 2 seconds it will cut off power to the pumpBad fuel pump relay or blown fuse.

ON SOME CHEVY VEHICLES THE OIL PRESSURE SWITCH HAS A DOUBLE RELAY BUILT INTO IT THAT IF IT IS BAD WILL ALSO FEED THE FUEL PUMP EVEN WITH THE IGNITION OFF

As well if the inertia switch was tripped that will also stop power to the fuel pump.

Would this cause the HVAC #21 fuse in the inside of truck to keep blowing?

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โˆ™ 2012-07-06 18:45:26
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Q: What stops power to the fuel pump?
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