Mitsubishi 1989-1993 GALANT Service Manual page 456

13-314
FUEL SYSTEM <DOHC> -
Condition
After the engine is stopped, the fuel injector leakage
pressure drops graudally.
There is a sudden sharp drop of the fuel
pressure immediately after the engine is
stopped.
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.
Probable cause
Leakage at the fuel pressure reg-
ulator valve seat
The check valve (within the fuel
pump) is not closed.
(16) Reduce the internal pressure of the fuel pipes and hoses.
(Refer to P. 13-l 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.
hose with a new one.
rail, tighten the installation bolt.
the fuel pump so as to activate the fuel pump.
With fuel pressure applied, check for leakage of the fuel
line.
TSB Revision
Remedy
Replace the injector.
Replace the fuel pressure regula-
tor.
Replace the fuel pump.