Crown Victoria V8-281 4.6L SFI (1998)
Fuel Pressure Regulator: Description and Operation
The fuel pressure regulator:
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is mounted on the fuel injection supply manifold downstream of the fuel injectors.
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regulates the fuel pressure supplied to the fuel injectors.
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is a diaphragm-operated relief valve in which one side of the diaphragm senses fuel pressure and the other side is subjected to intake manifold
vacuum.
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nominal fuel pressure is established by a spring preload applied to the diaphragm.
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balances one side of the diaphragm with manifold pressure to maintain a constant fuel pressure drop across the fuel injectors.
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bypasses and returns excess fuel to the fuel tank.