Chrysler Concorde 1993 Service Manual page 504

Fig. 30 Checking Fuel Pressure Between Pump and
the ON position, repeat the ASD Fuel System Test.
• If pressure is at least 5 psi higher than reading
recorded in step (4), replace fuel filter.
• If no change is observed, gently squeeze return
hose. If pressure increases, replace pressure regula-
tor. If the gauge reading does not change when the
return hose is squeezed, the problem is either a
plugged inlet strainer or defective fuel pump.
Fuel System Pressure Above Specifications
If the fuel pressure reading in step (4) was above
specifications test the system according to the follow-
ing procedure.
WARNING: FUEL SYSTEM PRESSURE MUST BE
RELEASED BEFORE A FUEL SYSTEM HOSE OR
COMPONENT IS DISCONNECTED.
(a) Perform Fuel Pressure Release procedure.
(b) Install Fuel Pressure Gauge C-4799 and Fuel
Pressure Adapter 6631 in the fuel supply line (Fig.
16) between the fuel tank and fuel filter.
(c) Remove the fuel return line hose from the
fuel pump at fuel tank. Connect Fuel Pressure Test
Adapter 6668 to the return line. Place the other
end of adapter 6668 into an approved gasoline con-
tainer (minimum 2 gallon size). All return fuel will
flow into container.
(d) Using the DRB II, with the ignition key in
the ON position, repeat the ASD Fuel System Test.
• If pressure is now correct, replace fuel pump as-
sembly.
• If pressure is still above specifications, remove
fuel return hose from chassis fuel tubes (at engine).
Attach Fuel Pressure Test Connect Adapter 6668 to
the fuel return tube and place other end of hose in
clean container (Fig. 31). Repeat test. If pressure is
now correct, check for restricted fuel return line. If
no change is observed, replace fuel pressure regula-
tor.
Filter
Fig. 31 Fuel Return Line Adapter
FUEL TUBES AND QUICK-CONNECT FITTINGS
The LH fuel system uses two different types of
quick-connect fittings. The fittings have different re-
moval and installation procedures. The fuel pump
module uses plastic quick-connect fittings. The fuel
filter and fuel rail connections use metal quick-con-
nect fittings.
PLASTIC QUICK-CONNECT FITTINGS
The nylon fuel tubes connect to the pump module
with plastic quick-connect fuel fittings. The fitting
contains non-serviceable sealed O-rings (Fig. 32).
Fig. 32 Plastic Quick-Connect Fittings
CAUTION: Quick-connect fittings are not serviced
separately. Do not attempt to repair damaged quick-
connect fittings or fuel tubes. Replace the complete
fuel tube/quick-connect fitting assembly.
The quick-connect fitting consists of the O-rings,
retainer and casing (Fig. 33). When the fuel tube en-
ters the fitting, the retainer locks the shoulder of the
nipple in place and the O-rings seal the tube.
FUEL SYSTEMS 14 - 11