Tempo L4-140 2.3L CFI (1985)
N802239-S
Hairpin Clip
1
3.
Remove hairpin clip from push connect fitting at the fuel charging assembly and disconnect fuel line from fuel charging assembly using
appropriate safety precautions (for example, a cloth over end of fuel line.)
4.
Using hairpin clips, install test apparatus, between the disconnected fuel line and the fuel charging assembly. The shut-off valve should be in the
open position.
5.
Reconnect the inertia switch.
6.
Start the engine and allow fuel pressure to stabilize. If engine will not start and fuel pressure is 69 kPa. (10 psi) or less, check fuel pump electrical
circuit for continuity and fuel pump for flow per TSB 85-9-13. Replace fuel pump/sender unit assembly if faulty and retest to confirm proper
operation. If fuel pressure is between 69 and 90 kPa (10-13 psi), increase pressure to 100 kPa (14.5 psi). Remove welsh plug on top of fuel
pressure regulator to gain access to fuel adjustment screw.
7.
If fuel pressure is within 90-110 kPa. (13-16 psi.) the operating pressure is normal. When engine operation is stable, close the shut-off valve. If
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
