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Re: Urgent ! fuel pump check valve - broken latch Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Sun, 21 Jul 2013 21:28:10 In Reply to: Re: Urgent ! fuel pump check valve - broken latch, BobS, Sun, 21 Jul 2013 21:13:34 Members do not see ads below this line. - Help Keep This Site Online - Signup |
BobS wrote: "Once the engine is turning (cranking or running) the fuel pump will run until the ignition switch is turned off or the engine stops turning."
I believe that after the first second or so of initial running, the ECU "reads" the Crank Position Sensor (looks for pulses) to determine that the engine is rotating; if rotation is detected the ECU will energize the lead to the fuel pump relay. No rotation and the ECU will not energize the lead to the relay and the fuel pump will not run.
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