Acura 3.5 RL, Manual

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Fuel Supply System
System Description
The fuel supply system consists of a fuel tank, in-tank
high-pressure fuel pump, PGM-FI main relay, fuel filter,
fuel pressure regulator, fuel pressure regulator control
solenoid valve, injectors, and fuel delivery and return
lines. This system delivers pressure-regulated fuel to the
injectors and cuts the fuel delivery when the engine is
not running.
Fuel Pressure
Relieving
Before disconnecting fuel pipes or hoses, release pres-
sure from the system by loosening the service bolt on
top of the fuel filter.
SERVICE
BOLT
12 N-m
(1.2 kgf-m, 8.7 Ibf-ft)
FUEL
FILTER
SHOP TOWEL
NOTE:
• A fuel pressure gauge can be attached at the ser-
vice 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.
2. Remove the service bolt on the fuel filter while hold-
ing the banjo bolt with another wrench. Attach the
special tool.
FUEL FILTER
3. Start the engine. Measure the fuel pressure with the
engine idling and the vacuum hose of the fuel pres-
sure regulator disconnected from the fuel pressure
regulator and pinched. If the engine will not start,
turn the ignition switch ON (II), wait for two sec-
onds, turn it OFF, then back on again and read the
fuel pressure.
Pressure should be:
299 - 348 kPa (3.05 - 3.55 kgf/cm
2
, 43.4 - 50.5 psi)
4. Reconnect vacuum hose to the fuel pressure regula-
tor.
Pressure should be:
240 - 289 kPa (2.45 - 2.95 kgf/cm
2
, 34.8 - 41.9 psi)
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
11-135 ).
• If the fuel pressure is lower than specified, inspect
for:
— Clogged fuel filter.
— Faulty fuel pressure regulator (see page
11-135 ).
— Fuel line leakage.
1. Make sure you have the anti-theft code for the
radio, then write down the frequencies for the
radio's preset buttons.
2. Disconnect the battery negative cable from the bat-
tery negative terminal.
3. Remove the fuel fill cap.
4. Use a box end wrench on the service bolt at the fuel
filter while holding the special banjo bolt with
another wrench.
5. Place a rag or shop towel over the service bolt.
6. Slowly loosen the service bolt one complete turn.
7. Reconnect the battery, enter the anti-theft code for
the radio, then enter the customer's radio station
presets.
• 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.
CLAMP
FUEL
PRESSURE
REGULATOR
FUEL
PRESSURE
GAUGE
07406-0040001