Fuel Pressure Regulator: Description and Operation

LOCATION

The pressure regulator is located at the back of the throttle body.


PURPOSE

The regulator maintains fuel pressure at constant 100 kPa (14.5 psi) across the fuel injector tip.


OPERATION

Fuel Pressure Regulator Operation (Typical):

When the fuel pump is operational, fuel flows past the injectors into the pressure regulator. The fuel return port is blocked by a spring loaded rubber diaphragm. When fuel pressure reaches 100 kPa (14.5 psi), it pushes the diaphragm away from the fuel return port. Fuel flows through the return line to the fuel tank. The diaphragm is constantly moving from the open to closed position to keep fuel pressure constant.