Mitsubishi MOTORS Space Runner 1998, Workshop Manual

Page: 219 / 1164

GDI <4G6> -
On-vehicle Service
13A-101
Symptom Probable cause Remedy
D Fuel pressure too low Clogged fuel filter Replace fuel filter
D Fuel pressure drops after racing
Fuel leaking to return side due to poor
fuel pressure regulator (low pressure)
valve seating or settled spring
Replace fuel pressure regulator
(low pressure)
Low fuel pump (low pressure)
delivery pressure
Replace the fuel pump (low pressure)
Fuel pressure too high Binding valve in fuel pressure
regulator (low pressure)
Replace fuel pressure regulator
(low pressure)
Clogged fuel return hose or pipe Clean or replace hose or pipe
13. 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.
Symptom Probable cause Remedy
Fuel pressure drops gradually after
engine is stopped
Leaky fuel pressure regulator (low
pressure) valve seat
Replace fuel pressure regulator
(low pressure)
Fuel pressure drops sharply
immediately after engine is stopped
Check valve in fuel pump (low
pressure) is held open
Replace the fuel pump (low pressure)
14. Release residual pressure from the fuel pipe line. (Refer
to P.13A-103.)
15. Remove the fuel pressure gauge and special tools from the
fuel pump (high pressure).
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.
16. Replace the O-ring at the end of the high-pressure fuel
hose with a new one. Furthermore, apply engine oil to
the new O-ring before replacement.
17. Fit the high-pressure fuel hose to the fuel pump (high
pressure) and tighten the mounting bolt to specified
torque.
18. Check for any fuel leaks by following the procedure in
step 7.
19. Disconnect the MUT-
II
.