300ZX Coupe V6-2960cc DOHC (VG30DE) (1994)
Fuel Pressure Regulator: Testing and Inspection
Fuel Pressure Testing
With the Pressure Regulator vacuum hose disconnected, check for fuel in the vacuum hose, indicating a leaking Pressure Regulator diaphragm.
Test Fuel Pressure Regulator using following steps:
1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine side).
3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.
AT IDLING:
When fuel pressure regulator valve vacuum hose is connected.
Approximately 250.1 kPa (2.55 kg/cm2, 36.3 psi)
When fuel pressure regulator valve vacuum hose is disconnected.
Approximately 299.1 kPa (3.05 kg/cm2, 43.4 psi)