Caravan FWD V6-3.8L VIN L (1999)
Fuel Pressure Regulator: Description and Operation
OPERATION
The fuel system uses a nonadjustable pressure regulator that maintains fuel system pressure at approximately 338 kPa (49 psi), 3.31 FFV uses
approximately 379 kPa (55 psi). The fuel pressure regulator contains a diaphragm, calibrated spring and a fuel return valve. The spring pushes
down on the diaphragm and closes off the fuel return port. System fuel pressure reflects the amount of fuel pressure required to open the return
port.
The pressure regulator is a mechanical device that is NOT controlled by the PCM or engine vacuum.
