Description
The fuel pressure regulator maintains a constant fuel
pressure to the fuel injectors. When the difference be-
tween the fuel pressure and manifold pressure exceeds
3.5 kg/cm2 (50 psi), the diaphragm is pushed upward,
and the excess fuel is fed back into the fuel tank
through the fuel return pipe.
CLOSE
INTAKE MANIFOLD
VACUUM
DIAPHRAGM
FUEL
INLET
INTAKE MANIFOLD
VACUUM
DIAPHRAGM
OPEN
FUEL
RETURN
FUEL
INLET
(cont’d)
2. Reconnect the vacuum hose to the fuel pressure
regulator.
3. Check that the fuel pressure rises when the
vacuum hose from the fuel pressure regulator is
disconnected again.
If the fuel pressure did not rise, replace the fuel
pressure regulator.
Testing
Do not smoke during the test. Keep
open flames away from your work area.
1. Attach a pressure gauge to the service port of the
fuel filter (see page 11-106).
Pressure should be:
330–370 kpa (3.30–3.70 kg/cm2, 46–53 psi)
(with the fuel pressure regulator vacuum hose
disconnected and pinched)
FUEL
PRESSURE FUEL PRESSURE GAUGE
REGULATOR 07406–0040001
Fuel Supply System
Fuel Pressure Regulator (cont’d)
Replacement
Do not smoke while working on fuel
Fuel Filter
Replacement
Do not smoke while working on fuel
The fuel fitter should be replaced: every 4 years or
60,000 miles (96,000 km), whichever comes first or
whenever the fuel pressure drops below the specified
value (330-370 kPa (3.30-3.70 , 46-53 psi)
with the fuel pressure regulator vacuum hose discon-
nected) after making sure that the fuel pump and the
fuel pressure regulator are OK.
1. Place a shop towel under and around the fuel filter.
2. Relieve fuel pressure (see page 11-105).
3. Remove the 12 mm banjo bolt and the fuel feed
pipe from the filter.
4. Remove the fuel filter clamp and fuel filter.
5. When assembling, use new washers, as shown.
1. Place a shop towel under fuel pressure regulator,
then relieve fuel pressure (see page 11-105).
2. Disconnect the vacuum hose and fuel return hose.
3. Remove the two 6 mm retainer bolts.
FUEL
PRESSURE
REGULATOR
O-RING
Replace.
NOTE:
12 N.m
(1.2 kg-m,
9 Ib.ft)
SERVICE BOLT
12 N.m (1.2 kg-m, 9 Ib-ft)
BANJO BOLT
28 N.m (2.8 kg-m, 20 Ib-ft)
WASHER
Replace
28 N·m
(2.8 kg-m,
20 Ib-ft)
WASHER
Replace
10 N.m (1.0 kg-m, 7 Ib-ft)
WASHER
Replace
system. Keep open flame away from your work
area.
system. Keep open flame away from your work
area.
Replace the O-ring.
When assembling the fuel pressure regulator,
apply clean engine oil to the O-ring and assem-
ble it into its proper position, taking care not to
damage the O-ring.