Mechanics

FUEL RAIL TEST PORT

1997 Infiniti J30

Engine Performance problem
1997 Infiniti J30 6 cyl Two Wheel Drive Automatic 140000 miles

Where is the fuel rail test port located? Does it have a schrader valve?
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Dmadden
May 19, 2010.



Checking Fuel Pressure
Disconnect fuel hose on fuel filter outlet side and install fuel pressure gauge. Replace pump fuse. Start engine and check fuel line connections for leakage. Check fuel pressure with engine idling. Record fuel pressure gauge reading.
Disconnect and plug vacuum hose from pressure regulator and immediately note fuel pressure. Record fuel pressure gauge reading. See FUEL PRESSURE table.
Connect a hand-held vacuum pump to fuel pressure regulator. Start engine and watch fuel pressure gauge as vacuum is changed. Fuel pressure should decrease as vacuum increases. If result is not as specified, replace fuel pressure regulator.
FUEL PRESSURE (At Idle)
Application(1) psi (kg/cm2 )(2) psi (kg/cm2 )
J3036 (2.6)43 (3.0)
(1)With vacuum hose connected at fuel pressure regulator. Fuel pressure should be 36psi
(2)With vacuum hose disconnected at fuel pressure regulator. Should be 43psi

Rasmataz
May 19, 2010.