Fuel Pump Connector Disconnection (How To Reduce The Fuel Pressure); Fuel Pump Operation Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

13D-84
Symptom
Fuel pressure drops gradually after
engine is stopped
Fuel pressure drops sharply
immediately after engine is stopped
Fuel pump relay
MPI -
On-vehicle Service
15. Stop the engine and check change of fuel pressure gauge
reading. Normal if the reading does not drop within 2
minutes. If it does, observe the rate of drop and
troubleshoot and repair according to the table below.
Probable cause
Leaky injector
Leaky fuel regulator valve seat
Check valve in fuel pump is held open
16. Release residual pressure from the fuel pipe line. (Refer
to P.13D-84.)
17. Remove the fuel pressure gauge and special tool from
the delivery pipe.
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.
18. Replace the O-ring at the end of the fuel high pressure
hose with a new one. Furthermore, apply engine oil to
the new O-ring before replacement.
19. Fit the fuel high pressure hose over the delivery pipe
and tighten the bolt to specified torque.
Tightening torque: 5 Nm
20. Check for any fuel leaks by following the procedure in
step 7.
21. Disconnect the MUT-II.
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE THE FUEL PRESSURE)
When removing the fuel pipe, hose, etc., since fuel pressure
in the fuel pipe line is high, do the following operation so
as to release fuel pressure in the line and prevent fuel from
running out.
1. Remove the fuel filler cap to release pressure in the fuel
tank.
2. Remove the fuel pump relay.
3. After starting the engine and letting it run until it stops
naturally, turn the ignition switch to OFF.
4. Install the fuel pump relay.

FUEL PUMP OPERATION CHECK

Refer to '99 SPACE RUNNER/SPACE WAGON Workshop
Manual (Pub. No. PWDE9803) GROUP 13A - On-vehicle
service.
Remedy
Replace injector
Replace fuel pressure regulator
Replace fuel pump