Wrangler L6-4.0L VIN S (2000)
Fuel Pressure Regulator: Description and Operation
FUEL FILTER/FUEL PRESSURE REGULATOR
Fuel Pump Module Components
Fuel Filter/Fuel Pressure Regulator
The combination fuel filter and fuel pressure regulator is located on the top of fuel pump module.
A combination fuel filter and fuel pressure regulator is used on all engines. A separate frame mounted fuel filter is not used with any engine.
Fuel Pressure Regulator Operation: The pressure regulator is a mechanical device that is not controlled by engine vacuum or the Powertrain
Control Module (PCM).
The regulator is calibrated to maintain fuel system operating pressure of approximately 339 ± 34 kPa (49.2 ± 5 psi) at the fuel injectors. It
contains a diaphragm, calibrated springs and a fuel return valve. The internal fuel filter is also part of the assembly.