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Once you turn the key on it runs for one second & then quits.Is there a fuel pump sensor that could cause this or is the pump going out. free flowing & under pressure

This was tested at the throttle body and at the fuel pump. could it be a sensor or just a bad pump

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  • Cars & Trucks Master
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Only a guess as you don't state model or make. If you are testing fuel pressure at the throttle body you have a TBI system.
The ECM controls the fuel pump by allowing a short run time to prime and then requires oil pressure to keep the pump running.
If you are testing with out the motor running you are only getting the prime signal.

Posted on Apr 27, 2015

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Ran a hot wire to what fuel pump or the control module ? Which of these is yours ?
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Figure 10: Fuel Pump Flow Control Module (Except LY6) Does yours have fuel pump flow control module under the vehicle Fuel Pump Flow Control Module (except LY6)
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If your vehicle has this system check it for DTC'S - diagnostic trouble codes . Will take guess work out of it .
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