Chrysler neon 1997 Service Manual page 535

RETAINER "EAR"
14 - 6 FUEL SYSTEM
DESCRIPTION AND OPERATION (Continued)
Fig. 6 Plastic Quick-Connect Fittings
The quick-connect fitting consists of the O-rings,
retainer and casing (Fig. 6). When the fuel tube
enters the fitting, the retainer locks the shoulder of
the nipple in place and the O-rings seal the tube.
ROLLOVER VALVES
All PL vehicles have two rollover valves. One in
the fuel filler tube and the other on the top of the
fuel tank. The valves prevent fuel flow through the
fuel tank vent valve hoses should the vehicle rollover.
DIAGNOSIS AND TESTING
FUEL PUMP PRESSURE TEST
The fuel system operates at approximately 338 kPa
(49 psi). Check fuel system pressure at the test port
on the fuel rail (Fig. 7).
(1) Remove cap from fuel pressure test port on fuel
rail.
(2) Connect Fuel Pressure Gauge C-4799B to test
port (Fig. 8).
CAUTION: When using the ASD Fuel System Test,
the ASD relay and fuel pump relay remain energized
for 7 minutes or until the test is stopped, or until
the ignition switch is turned to the Off position.
(3) Place the ignition key in the ON position.
Using the DRB scan tool, access ASD Fuel System
Test. The ASD Fuel System Test will activate the fuel
pump and pressurize the system.
CASING WINDOW WINDOW RETAINER TAB O RINGS NIPPLE FUEL SPARK INSULATOR INJEC- TORS PLUG
FUEL RAIL
Fig. 7 Fuel Pressure Test Port—Typical
Fig. 8 Checking Fuel Pressure at Intake Manifold—
• If the gauge reading equals 338 kPa (49 PSI)
further testing is not required. If pressure is not cor-
rect, record the pressure.
• If fuel pressure is below specifications, refer to
the Fuel Pressure Diagnosis Chart (Fig. 9).
• If fuel pressure is above specifications (54 psi or
higher) check for a kinked or restricted fuel supply
line. If the supply line is not kinked or restricted,
replace the Fuel Filter/Pressure Regulator.
IGNITION COILS C-4799-B FUEL PRESSURE GAUGE TEST PORT NECTOR ELECTRICAL CON-
FUEL RAIL TEST PORT SPARK
Typical
FUEL RAIL PLUG
CABLE
PL