Intrigue V6-3.8L VIN K (1998)
Fuel Pressure Regulator: Description and Operation
The cartridge type fuel pressure regulator (1) is a diaphragm-operated relief valve (6) with fuel pump pressure on one side and regulator spring (2)
pressure, and intake manifold vacuum on the other side. The regulators function is to maintain a constant fuel pressure across the injectors at all times.
The pressure regulator compensates for engine load by increasing fuel pressure as engine vacuum drops. The cartridge regulator is serviced as a separate
component. When servicing the fuel pressure regulator, insure that the O-ring backup, (3) large O-ring, (4) filter screen, (5) and small O-ring (7) are
properly placed on the pressure regulator.
If the fuel pressure is too low, poor performance and a DTC P0171, could result. If the pressure is too high, excessive odor and a DTC P0172, may
result. Refer to Fuel Pressure for information on diagnosing fuel pressure conditions.
