Tempo L4-140 2.3L CFI (1985)
pump operation is normal, fuel dead head pressure should increase to 124-172 kPa. (18-25 psi).
8.
When the fuel starved engine stalls, check the pressure gauge indication. If pressure is maintained above 69 kPa. (10 psi) for 60 seconds, the check
valve in the fuel pump sending unit is functioning correctly.
NOTE:
After engine stalls, fuel pressure may decrease.
9.
Open the shut-off valve slowly. If the fuel pressure bleeds down to zero, check for pressure regulator or fuel injector leakage. (See Procedures 2
and 3).
10.
If the system remains slightly pressurized, the fuel system is "O.K.".
11.
Repeat Steps 1 and 2 above. Remove hairpin clips from the test apparatus push connect fittings, remove test apparatus, replace vehicle fuel line
using a new hairpin clip. Reconnect the inertia switch.
PROCEDURE 2
FUEL CHARGING ASSEMBLY INJECTOR/REGULATOR - VACUUM BLEED DOWN SYSTEM CHECK
2.3L HSC CFI-IV - 1985 TEMPO, TOPAZ
TEST STEP
RESULTS
ACTION TO TAKE
STEP 1
Remove fuel inlet and outlet lines at fuel charging
^ Vacuum holds less or
^ Injector/"O"-Ring
assembly (FCA). Connect hand vacuum pump at
drops less than 1 in. Hg
regulator seat/valve
charging assembly inlet (outlet open) and apply
in 30 seconds.
system O.K. STOP
15-20 in. Hg vacuum. Vacuum should drop no
greater than 1 in.-Hg in 30 seconds.
^ Vacuum drops greater
^Go to Step 2.
than 1 in.-Hg in 30 seconds.
STEP 2
Cap outlet at fuel charging assembly (FCA) and
^ Vacuum holds or drops
^ Remove regulator
repeat Step 1.
less than 1 in.-Hg in 30
diaphragm, seat/valve
seconds.
and clean or replace as
necessary and repeat
^
Vacuum drops greater ^ Go to Step #3 than 1 in.-Hg in 30 seconds.
STEP 3
Plug injector tip outlet with index finger and repeat
^ Vacuum holds or drops
^ Injector stuck open -
Step 1.
less than 1 in.-Hg in 30
replace and retest.
30 seconds.
^
Vacuum drops greater ^ Injector "O"-ring leak than 1 in.-Hg. (upper or lower) replace
O-ring and retest.
Procedure 3
FUEL CHARGING ASSEMBLY (F.C.A.) FUEL PRESSURE REGULATOR, UNDERHOOD FUEL FILTER AND RETURN LINE SYSTEM
CHECK 2.3L HSC CFI-IV - 1985 TEMPO, TOPAZ
TEST STEP
RESULTS
ACTION TO TAKE
STEP 1
Check system fuel pressure using 0-30 psi test
^ Pressure low
^ Perform fuel pump
described in Procedure at idle. System pressure
less than 13 psi
check procedure per
should be between 13-12 psi.
Procedure 1.
^
If pressure is still low, perform FCA injector/ regulator vacuum bleed down system check.
^
Pressure high ^ Connect external fuel greater than 16 psi line from FCA. Outlet to
vehicle tank and retest
-
If O.K. check for blocked or kinked return line.