Fig,
4A-35
Fuel
outlet
hose
Fuel
container
Fig.
4A-36
Pressure gauge
Carburetor
Fuel
inlet
line
to
carburetor
4A-C
. THROTTLE OPENER SYSTEM
(Air conditioning)
4A-C-1.
Checking Throttle Opener
1 . Connect a tachometer to the engine.
2. Warm
up
the engine and run it at idle.
4A
3. Stop the engine and remove the air cleaner.
4. Disconnect the vacuum sensing tube (servo diaphragm
~
three way solenoid valve) at the·servo diaphragm.
5.
Connect the inlet manifold and the servo diaphragm
with a suitable tube so that the inlet manifold
vacuum can be led directly to the servo diaphragm.
6. Disconnect the vacuum sensing tube (caburetor
~
1st stage valve) at the
EGR
valve
.
7. Disconnect the vacuum sensing tube (carburetor -
distributor) at the distributor.
8. Start the engine and increase the engine speed to
about 2,000 rpm.
9. Decrease the engine speed and make sure the engine
speed
is
1,200 j
0
rpm.
If
the engine speea
is
not
within the specification,
turn
the throttle opener adjusting screw
in
or
out
until the specified engine speed
is
obtained.
4A
-D
. FUEL
PUMP
4A-D-1.
Testing Fuel Pump
The tests are performed with the pump installed
on
the car.
Before the tests, make sure
the
fuel filter has been
changed with the recommended maintenance mileage
interval. When in doubt, install a new filter.
a. Pressure test
1. Remove the air cleaner assembly. Disconnect the
fuel inlet line at the carburetor. Use care
to
prevent
combustion due
to
fuel spillage.
2. Connect a pressure gauge, a restrictor and flexi-
ble hoses between the fuel line and the carburetor.
3. Position the flexible hose and restrictor so
that
the
fuel can be discharged into a suitable, graduated
container.
4.
Before taking a pressure reading, turn the ignition
switch on and vent the system into the container
by
opening the hose restrictor momentarily.
5. Close the hose restrictor, allow the pressure to
stabilize, and note the reading.
If
the reading
is
not
within the specification, and the
fuel lines and filter are in satisfactory condition, the
pump
is
damaged and should be replaced.
If
the pump pressure
is
within the specifications, per-
from the test for volume.
Standard pressure
0.20
-
0.25
kg/cm2
(2.84
~
3.56
lb/in2)
b. Volume test
Turn the ignition switch
on,
open the hose restrictor
and expel the fuel into the container.
Volume
More
than
800
cc
(0.8 U.S.
quart,
0.7 Imp. quart) within
one
minute
4A :
IO
•.
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