Pontiac FIREBIRD 1972 Service Manual page 675

ENGINE FUEL
CAUTION: Any rubberparts, plastic parts, dia-
phragms, pump plungers, should not be im-
mersed in carburetor cleaner. However, the air
horn, which has the plastio pressure relief
valve, will withstand normal cleaning in carbu-
retor cleaner. Make sure the cleaner is
thoroughly removed fram valve cavity.
Blow out all passages in castings with compressed air.
Do not pass drills through jets or passages.
Inspect idle mixture needle (if removed) for damage.
Examine float needle and seat assembly for wear.
Install a new factory matched set if worn.
Inspect upper and lower casting sealing surfaces for
damage.
Inspect holes in levers for excessive wear or out-of-
round condition. If levers or rods are worn, they
should be replaced.
FLOAT BOWL
ASSEMBLE (Fig. 68-21)
1. Install the electrically operated idle stop solenoid.
2. Install round seal into recess in hot idle compensator
cavity in float bowl, then install hot idle compensa-
tor.
3. Install hot idle compensator cover, retaining with
two attaching screws. Tighten securely.
4. Install main metering jet into bottom of float bowl.
Tighten securely.
5. Install float needle seat and gasket.
6. Install idle tube flush with bowl casting.
7. Install pump discharge ball, spring and "tee" retainer
into pump discharge hole.
8. Push down on pump discharge "tee" until flush with
bowl casting.
Examine fast idle cam for excessive wear or damage.
9. Install fuel filter spring, filter, inlet nut and gasket.
Check throttle and choke levers and valves for binds
and other damage.
Check all springs for distortion or loss in tension,
replace if necessary.
ASSEMBLE AND INSTALL (Fig. 68-22)
1. If removed, install idle mixture needle and spring
until lightly seated. Back out four turns as a prelimi-
nary idle adjustment.
NOTE: The plastic limiter cap should not be
installed on the idle mixture needle until the
idle mixture has been adjusted as specified in
Section 6D.
2. Invert float bowl and install new throttle body to
bowl insulator gasket, making sure all holes in gasket
align with holes in float bowl.
3. Install throttle body on bowl gasket so that all holes
in throttle body are aligned with holes in gasket.
4. Install two throttle body to bowl attaching screws.
Tighten evenly and securely (12-15 lb. ft.).
The throttle body to bowl screws do not use lock washers
as they have an interference fit designed into the
thread for holding proper torque.
10. Install accelerator pump return spring into bottom of
I
pump well. Press downward on spring until seated in
cavity.
11. Install power piston return spring into piston cavity
in the bowl.
12. Install power piston actuating rod (right angle end)
into slot in the power piston.
13. Install power piston, metering rod and actuating rod
assembly into the float bowl. End of actuating rod
must enter hole in bowl. Locate metering rod into jet
orifice.
14. Install pump plunger assembly into pump well with
actuating lever protruding through bottom of bowl
casting. Push downward on pump lever and install
pump assembly drive link into slot at lower end of
pump shaft. Ends of drive link point inward toward
carburetor bore. Tangs on ends of drive link retain
link to pump shaft end of pump actuating lever.
15. Install lower end of pump link into actuator lever
which fits on the end of the throttle shaft.
16. Install curved power piston actuating link into throt-
'
tle actuating lever. Lower end of link protrudes out-
ward away from throttle bore and has a tang which
retains the link to the actuator lever.
17. Before fastening power piston and pump actuator
lever to end of throttle shaft, hold power piston as-