Checking Fuel Pressure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Infiniti QX4, 2003 Infiniti Q45, 2003 Infiniti M45, 2003 Infiniti I35, and 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

Release fuel pressure to zero. See FUEL PRESSURE RELEASE . Install the inline fuel quick disconnected fitting between fuel damper and injector tube. See Fig 1, Fig 2, Fig 3 or Fig 4 . Connect the fuel pressure test gauge (quick connector adapter hose) to the inline fuel quick disconnected fitting.
Turn ignition switch ON and check for fuel leakage. Start engine and check for fuel leakage. Record fuel pressure gauge reading. See FUEL PRESSURE table.
If result is unsatisfactory, check the following, fuel hoses and fuel tubes for clogging, fuel filter for clogging, fuel pump, and fuel pressure regulator for clogging. If OK, replace fuel pressure regulator. If not OK, repair or replace components as necessary.

FUEL PRESSURE

Application	psi (kg/cm² )
All Models	51 (3.57)

Fig 1: Installing Fuel Pressure Gauge (FX35 & G35)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Installing Fuel Pressure Gauge (FX45, M45 & Q45)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Installing Fuel Pressure Gauge (I35)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Installing Fuel Pressure Gauge (QX4)

Courtesy of NISSAN MOTOR CO., U.S.A.