Ford Mustang Forum - View Single Post - Squeal from engine only when key is turned on
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post #7 of (permalink) Old 01-25-2011 Thread Starter
bataradena
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Joined: Nov 2010
Location: Tucson.
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I did find this information;

The fuel pump logic is defined in the Fuel System control strategy and is executed in the PCM. The PCM will ground the fuel pump relay for one second during key on and engine off. During crank the fuel pump relay is grounded as long as the PCM receives a CKP signal
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