Mitsubishi 1992 3000GT, Service Manual

Page: 284 / 1308

MULTIPORT On-Vehicle Inspection of
FUEL INJECTION
FUEL PRESSURE TEST
(1) Reduce the internal pressure of the fuel pipes and hoses.
(2) Disconnect the fuel high pressure hose at the fuel rail
side.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
(3) Set a fuel pressure gauge on the special tool, placing
an adequate O-ring or gasket between the gauge and
special tool prevent fuel leaks.
(4) Attach the special tool set in step (3) to the fuel rail between
high pressure hoses.
(5) Connect a jumper wire to the terminal for activation of
the fuel pump and to the positive terminal of the battery
to activate the fuel pump. With fuel pressure applied,
check to be sure that there is no fuel leakage from the
fuel pressure gauge and the special tool connection part.
(6) Disconnect the jumper wire (from the terminal for activation
of the fuel pump) to stop the fuel pump.
(7) Start the engine and let it idle.
(8) Measure the fuel pressure during idling.
Standard value:
270 (38 psi) at curb idle
<Turbo> Approx. 235 (34 psi) at curb idle
TSB Revision