Fuel Pump Module Overview - Escape 2WD L4-23L VIN Z (2005)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator
FUEL PRESSURE REGULATOR
Fuel Pressure Regulator
The fuel pressure regulator is attached to the fuel rail downstream of the fuel injectors. It regulates the fuel pressure supplied to the fuel injectors. The
regulator is a diaphragm-operated relief valve. One side of the diaphragm senses the fuel pressure and the other side is connected to the intake manifold
vacuum. Fuel pressure is established by a spring preload applied to the diaphragm. Balancing one side of the diaphragm with manifold vacuum maintains
a constant fuel pressure drop across the fuel injectors. Fuel pressure is high when engine vacuum is low. Excess fuel is bypassed through the fuel
pressure regulator and returned through the fuel return line to the fuel tank.
