Fuel Pressure
Relieving
Before disconnecting fuel pipes or hoses, release pres-
sure from the system by loosening the 6 mm service
bolt on top of the fuel filter.
• Do not smoke while working on the fuel system.
Keep open flames or sparks away from your work
area.
• Be sure to relieve fuel pressure while the ignition
switch is off.
1. Disconnect the battery negative cable from the bat-
tery negative terminal.
2. Remove the fuel fill cap.
3. Place a box end wrench on the 6 mm service bolt at
the fuel filter, and hold the special banjo bolt with
another wrench.
4. Place a rag or shop towel over the 6 mm service
bolt.
5. Slowly loosen the 6 mm service bolt one complete
turn.
NOTE:
• A fuel pressure gauge can be attached at the 6 mm
service bolt hole.
• Always replace the washer between the service
bolt and the special banjo bolt whenever the ser-
vice bolt is loosened.
• Replace all washers whenever the bolts are
removed.
Inspection
1. Relieve fuel pressure (see page 11-132)
2. Remove the service bolt on the fuel filter while
holding the banjo bolt with another wrench. Attach
the special tool (see page 11-38).
3. Start the engine. *Measure the fuel pressure with
the engine idling and the vacuum hose of the fuel
pressure regulator disconnected from the fuel pres-
sure regulator and pinched.
Pressure should be:
324 – 363 kPa (3.3 – 3.7 kgf/cm2, 47 – 53 psi)
4. Reconnect vacuum hose to the fuel pressure regula-
tor.
Pressure should be:
250 – 304 kPa (2.55 – 3.1 kgf/cm2, 36 – 44 psi)
FUEL
PRESSURE
GAUGE
07406-0040001
CLAMP
FUEL PRESSURE
REGULATOR
If the engine will not start, turn the ignition switch on
(II) wait for two seconds, turn it off, then back on
again and read the fuel pressure.
If the fuel pressure is not as specified, first check the
fuel pump (see page 11-142). If the fuel pump is OK,
check the following:
— If the fuel pressure is higher than specified, inspect
for:
• Pinched or clogged fuel return hose or line.
• Faulty fuel pressure regulator (see page 11-137).
• Faulty fuel pump relay (see page 11-139).
— If the fuel pressure is lower than specified, inspect
for:
• Clogged fuel filter.
• Faulty fuel pressure regulator (see page 11-137).
• Leakage in the fuel line.
• Faulty fuel pump relay (see page 11-139).