Ford COUGAR 1968 Shop Manual page 473

PART 10-1
-
G e n e r a l Fuel System Service
10-13
B E N D H E R E TO
J
ADJUST CLEARANCE
WITH ENGINE TEMPERATURE STABILIZED
AND ENGINE OPERATING AT CURB IDLE
(HOT E N G I N E I S P E E D , BEND VENT ROO TO
OBTAIN SPECIFIED CLEARANCE BJIZBA
FIG. 38-Fuel Bowl Vent Valve
Adjustment-Hotley Model
41 50 4-V
does not permit a wet float setting. The
dry float setting is the final setting
and is made with the air horn assem-
bly removed from the carburetor.
The fuel pump pressure and volume
must be to specifications (Part 10-10)
prior to performing the following ad-
justments.
Autolite Model
2 100 2-V
1. Operate the engine to normalize
engine temperatures, and place the
vehicle on a flat surface as near level
as possible. Stop the engine.
2.
Remove the carburetor air
cleaner assembly (Part 10-7, Sec-
tion 2) and anchor screw,
i f
they have
not been previously removed.
3. Remove the air horn retaining
screws and the carburetor identifica-
tion tag. Temporarily place the air
horn and gasket in position on the
carburetor main body and start
the engine. Let the engine idle for
several minutes, then rotate the air
horn and remove the air horn gasket
to provide accessability to the float
assembly(ies).
4. While the engine is idling, use
a standard depth scale to measure
the vertical distance from the top ma-
chined surface of the carburetor
main body to the level of the fuel in
the fuel bowl (Fig. 39). The measure-
ment must be made at least 114
inch away from any vertical sur-
face to assure an accurate reading,
because the surface of the fuel is
concave (higher a t the edges than in
the center). Care must be exercised to
measure the fuel level at the point of
contact with the fuel. Refer to the
specifications (Part 10-10) for the
FIG. 39-Fuel Level Float
Adjustment (Wet)-Typical
for
Autolite Model 21 00 2-V
correct fuel level (wet) setting.
5. If any adjustment is required,
stop the engine to minimize the hazard
of fire due to fuel spray when the
float setting is distrubed. T o adjust
the fuel level, bend the float tab (con-
tacting the fuel inlet valve) upward
in relation to the original position to
raise the fuel level, and downward to
lower it. Each time an adjustment is
made to the float tab to alter the
fuel level, the engine must be started
and permitted to idle for at least
three minutes to stabilize the fuel
level. Check the fuel level after each
adjustment until the specified level is
achieved.
6. Install a new air horn gasket,
the air horn assembly, carburetor
identification tag and the retaining
screws. Tighten the retaining screws.
Install the air cleaner anchor screw.
7. Check the idle fuel mixture,
idle speed adjustments and the car-
buretog dashpot (if so equipped). Ad-
just the carburetor as required.
8. Install the air cleaner assembly
(Part 10-7, Section 2).
Holley Model
4 150 C 4-V
Position the vehicle on a level floor.
Be sure the fuel pump pressure is
within specifications. Operate the
engine until normal operating tem-
perature has been reached.
I. Check the fuel level in each
fuel bowl separately. Place a suitable
container below the fuel level sight
plug to collect any spillover of fuel.
Remove the fuel level sight plug add
gasket and check the fuel level (Fig.
40). The fuel level within the bowl
should be at the lower edge of the
sight plug opening
-
1/16 inch.
2. If the fuel level is satisfactory,
install the sight plug. Do not install
the air cleaner at this time.
3. If the fuel level is too high, stop
the engine, install the sight plug, drain
the fuel bowl and refill it and check
it again before altering the float
setting. This will eliminate the pos-
sibility of foregin material causing a
temporary flooding condition. T o
drain the fuel bowl, loosen one lower
retaining bolt from the fuel bowl and
drain the fuel into a suitable con-
tainer.' InS'tall the bolt and the fuel
lever sight plug, and start the engine
to fill the fuel .bowl. After the fuel
level has stabilized, stop the engine
and check the fuel level.
If the fuel level is too hiah. it
should first be lowered below specifi-
cations and then raised until it is just
at the lower edge of the sight plug
opening. If the fuel level is too low,
it is only necessary to raise it to the
specified level. Follow the procedure
under To Lower Fuel Level or To
Raise Fuel Level, whichever is applica-
ble.
T o Lower Fuel Level.
I. With the engine stopped. loosen
the lock screw on top of the fuel bowl
just enough to allow rotation of the
adjusting nut underneath (Fig. 23).
Do not loosen the lock screw or at-
tempt to adjust the fuel level with the
sight plug removed and the engine
running because the pressure in the
line will spray fuel out and present
a
fire hazard.
2.
Turn the adjusting nut ap-
proximately I/2 turn in to lower
the fuel level below spe'cifications (116
turn of the adjusting nut, depending
on direction of rotation. will raise or
ADJUSTING NUT
82714-A
FIG. 40-Fuel Level Float
Adjustment (Wet) Holley 4-V