1991 MITSUBISHI 3000GT fuel filter

FUEL SYSTEM - On-vehicle Inspection of Mql Components13439(10)Disconnect 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:
330
- 350 kPa (47 - 50 psi) at curb idle
295 - 315 kPa (43 - 45 psi) at curb idle(11
)Check to be sure that the fuel pressure during idling does
not decrease even after the engine is raced a few times.
(12)Use 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.
NOTEThere will be no fuel pressure in the return hose if there is
insufficient fuel flow.
(13)lf 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.
IConditionProbable cause1 RemedyI
l Fuel pressure is too low.l Fuel pressure drops duringracing.l No fuel pressure in fuel returnhose.
Malfunction of the valve seat withinthe fuel pressure regulator, or fuel
leakage to return, side caused byReplace the fuel filter.
Replace the fuel pressure regulator.
Fuel pump low discharge pressure.Replace the fuel pump.
Fuel pressure is too high.
The valve within the fuel pressureregulator is sticking.Replace the fuel pressure regulator.
Clogging of the fuel return hose and/Clean or replace the hose
and/oror the pipe.pipe.
No change of the fuel pressureDamaged vacuum hose or nippleReplace the vacuum hose, or clean
when the vacuum hose is connected clogging.the nipple.
and when not connected.
Malfunction of the fuel pressure controlChecking the fuel pressure controlsystem system
1 TSB Revision

13-144FUEL SYSTEM - Throttle- Body
DISASSEMBLY AND REASSEMBLY
2.0
Nni1.4ft.lbs.
/
Disassembly steps
1. Dash pot2. Hose
3. Vacuum valve
>

l *4. Throttle position sensor
(within idle position switch)
5.
Idle speed control servo
assembly
6. Throttle body
7FU1023
\7FU1057 1SERVICE POINT OF DISASSEMBLY
MlBSFAN
Caution
1.When loosening a Phillips screw which has been firmly
tightened, use a Phillips screwdriver that is an exact fitfor the screw.
2. Do not remove the throttle valve.
3.Be careful when removing the throttle position sensorand idle speed control servo mounting screws, as
adhesive has been applied these screws.
INSPECTION
Ml3SHAt.lDASH POT INSPECTION
(1) Check the dash pot diaphragm for damage. First, push up
the rod fully and closing tightly the nipple with a finger,
release the rod. The diaphragm is intact if the rod does not
return to the initial position while the nipple is held closed
with a finger. If the rod returns, the diaphragm is broken.
Replace the dash pot.
VACUUM VALVE INSPECTION
(1) Remove the filter from the vacuum valve.
(2) Connect a hand vacuum pump to the black nipple of the
vacuum valve.
(3) With the other nipple closed by the finger, apply a negative
pressure of 500 mmHg (19.7 in.Hg.) to make sure that the
negative pressure is maintained.
(4)Let go your finger and make sure that the negative pressure
leaks out gradually.
hSB Revision1

FUEL SYSTEM- Fuel Line and Vapor Line13451FUEL
LINE AND VAPOR LINEMlBKA-~
iREMOVAL AND INSTALLATION
i30 Nm
6

Removal steps
1, Reserve tank2. Battery
3. Battery tray with washer tank assembly
4. Purge control valve
M 5. Fuelvapor hose6. Canister
7. Vapor pipe assembly
l +8. Fuel return hosea*9. Eye bolt10. Gasket11. High pressure fuel pipel a 12. Fuel filter*I,13. Eye bolt
14. Gasket
l * 15. High pressure fuel hose
16. O-ring
w 17. Fuel vapor hose
18. Stone protector
19. Fuel vapor pipe20. Fuel return pipe
21. Fuel main pipe
Deli\rerye
i603N0012
1 TSB Revision

13-152FUEL SYSTEM- Fuel Line and Vapor Line
03FOO3
05FOO735 Nm7r; ft
Ihr-k” ._..I_.
@dFlare nut,xSERVICE POINTS OF REMOVAL
MlBKBAQ9. 13. REMOVAL OF EYE BOLT
Remove the eye bolt while holding the fuel filter nut
\securely.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressurein the fuel pipe line.
INSPECTION
MIBKCAJ
lCheck the hoses and pipes for cracks, bend, deformation
and clogging.
l Check the canister for clogging.
l Check the fuel filter for clogging and damage.
SERVICE POINTS OF INSTALLATION
MlSKDAU17.5. INSTALLATION OF FUEL VAPOR HOSE
/ 8. FUEL
RETURN HOSE
(1) If the fuel pipe has a stepped part, connect the fuel
hose to the pipe securely, up to the stepped part, as
shown in the illustration.
Iti(2) If the fuel pipe does not have a stepped part, connect
the fuel hose to the pipe securely, so that it is the
standard value.
Standard value: 25
- 30 mm (1.0 - 1.2 in.)
15. INSTALLATION OF HIGH PRESSURE FUEL HOSEApply engine oil to the hose union.
Insert the hose, being careful not to damage the O-ring, and
tighten securely.
CautionBecause there is high pressure applied between the
fuel pump and the injection mixer, be especially sure
that there is no fuel leakage in this area.
12. INSTALLATION OF FUEL FILTER(1) When installing the fuel filter, first temporarily install the
filter to the filter bracket; then insert the main pipe at
the connector part of the high pressure fuel pipe, and
manually screw in the main pipe’s flare nut.
(2) Holding the fuel filter nut, tighten the fuel main pipe’s
flare nut and eye bolt at the specified torque. Then
tighten the filter to the bracket.
TSB Revision1
‘d

FUEL SYSTEM - Fuel Filter13453
FUEL FILTERM13VA-.
/REMOVAL AND INSTALLATION
i&J
L
/Il Removal of Residual Pressure from
Post-installation Operation
l Checking for Fuel Leakage
Removal steps
1. Battery
2. Battery tray with washer tank assembly
3. Eye bolt4. Gasket
5. High pressure fuel hose
6. Connection of fuel main
pipe7. Mounting boltl *8. Fuel filterl *9. Eye bolt10. Gasket11. High pressure fuel pipe
l---
222 ft.lbs.03FOO12
Gasket
fuel pipe
&----Eye bo’t 03FOO13SERVICE POINTS OF REMOVAL
MlSVBAB3. 9. REMOVAL OF EYE BOLT
Remove the eye bolt while holding the fuel filter nut
securely.
Caution
Cover the hose connection with
rags to prevent splash
of fuel that could be caused by some residual pressurein the fuel pipe line.
SERVICE POINT OF INSTALLATION
M13VBAB8. INSTALLATION OF FUEL FILTER
(1) When installing the fuel filter, first temporarily install the
filter to the filter bracket; then insert the main pipe at
the connector part of the high pressure fuel pipe, and
manually screw in the main pipe’s flare nut.
(2) Holding the fuel filter nut, tighten the fuel main pipe’s
flare nut and eye bolt at the specified torque. Then
tighten the filter to the bracket.
TSB Revision