04
FUEL SYSTEM
VALVE>
Inspection of
Components
the vacuum hose from the fuel pressure
regulator, and then measure the fuel pressure while using a
finger to plug the end of the hose.
Standard value:
(47-53 psi) at curb idle
speed
to be sure that the fuel pressure during idling does
not decrease even after the engine is raced a few times.
a finger to gently press the fuel return hose while
repeatedly racing the engine, and check to be sure that
there is fuel pressure in the return hose also.
NOTE
There will be no fuel pressure in the return hose if there is
insufficient fuel flow.
the fuel pressure measured in steps (9) to (12) deviates
from the standard value range, check for the probable
cause by referring to the table below, and then make the
appropriate repair.
Condition
Probable cause
Remedy
. Fuel pressure
IS
too low.
Fuel filter is clogged.
Replace the fuel filter.
. Fuel pressure drops during
. No fuel pressure fuel return hose.
Malfunction of the valve seat
Replace the fuel pressure
in the fuel pressure regulator, or
tor.
fuel leakage to return side caused
by spring deterioration.
Fuel pump low discharge pressure.
Replace the fuel pump.
Fuel pressure is too
The valve within the fuel pressure
Replace the fuel pressure
regulator is sticking.
tor.
Clogging of the
fuel return hose
Clean or replace the hose and/or
the pipe.
pipe.
No change of the fuel pressure when Damaged vacuum hose or nipple
Replace the vacuum hose, or clean
vacuum hose
IS
connected and when not
clogging.
the nipple.
connected.
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
After the engine is stopped, the fuel Injector leakage
pressure drops
Remedy
Replace the injector.
Leakage at the fuel pressure
Replace the fuel pressure
ulator valve seat
tor.
There
IS
a sudden sharp drop of the fuel
The check valve
the fuel Replace the fuel pump.
pressure immediately after the engine is
pump) is not closed.
stopped.
TSB Revision
Summary of Contents for 1989 Galant
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