Ford Mustang Forum - View Single Post - Squeal from engine only when key is turned on
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post #8 of (permalink) Old 01-25-2011
SHELBY GT 350 Member
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Originally Posted by bataradena View Post
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
That picture is of the regulator itself. The 2002's use a fuel rail pressure sensor instead of a regulator. When you turn the key on, it will prime the system momentarily, but you mostly hear the pump out back, and not a squeal up front.....

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