Mitsubishi 1989 Galant, Service Manual

Page: 456 / 1273

13-314
FUEL SYSTEM <DOHC>
the engine and check for a change of the value
indicated by the fuel pressure gauge. The condition is
normal if there is no decrease of the indicated value within
two minutes.
If there is a decrease of the indicated value, monitor the
speed of the decrease, and, referring to the table below,
determine the cause of the problem and make the
appropriate repair.
Condition Probable cause Remedy
After the engine is stopped, the fuel injector leakage
pressure drops
Replace the injector.
Leakage at the fuel pressure
ulator valve seat
Replace the fuel pressure
tor.
There is a sudden sharp drop of the fuel
pressure immediately after the engine is The check valve (within the fuel
pump) is not closed.
Replace the fuel pump.
stopped.
(16) Reduce the internal pressure of the fuel pipes and hoses.
(Refer to P. 02.)
(17) Disconnect the fuel pressure gauge and the special tools
from the fuel rail.
Caution
Because there will be a some residual pressure in the
fuel pipe line, use a shop towel to cover so that fuel
doesn’t splatter.
the O-ring at the end of the fuel high-pressure
hose with a new one.
connecting the fuel high-pressure hose to the fuel
rail, tighten the installation bolt.
to be sure that there is no fuel leakage.
Apply battery voltage to the terminal for activation of
the fuel pump so as to activate the fuel pump.
With fuel pressure applied, check for leakage of the fuel
line.
TSB Revision