Metering Rod Adjustment; Float Level Adjustment - Pontiac Grand Prix Service Manual

BB-10 1969 PONTIAC SERVICE MANUAL
4. Install idle cornpensator cover, retaining with two
attaching screws. Tighten securely.
5. Install main metering jet into bottom of float bowl.
Tighten securely.
6. Install pump return spring into pump well. Make
sun spring is properly seated in bottom of well.
7. Install pump plunger into pump well with actuating
shaft protruding through bottom of bowl casting. Push
downward on pump plunger and install pump drive
link into hole in lower end of plunger shaft. Ends of
drive W point toward carburetor bore. Lip on upper
end of
link
retains link to pump shaft.
8. Install pump actuating lever to lower end of pump
drive
link
by aligning lip on rod with notch in lever.
Projection on actuating elver points downward. Install
power piston actuating link into opposite end of
actuating lever. Lower end of
link
has retaining lip
and faces outward (away from throttle bore).
9. Install end of power piston actuating rod into groove
on side of power piston. Then install power piston
spring, power piston, metering rod assembly and
actuating rod into float bowl. End of metering rod
must enter jet orifice.
10. Hold complete assembly downward in bowl, then
instau power piston drive link into hole in lower end of
power piston actuating rod (beneath bowl). Align D
hole in actuating lever with flats on throttle shaft and
install lever on end of throttle shaft. Install retaining
screw in end of throttle shaft and tighten securely.
11. Install idle tube into cavity in float bowl.
12. Install pump discharge ball, spring and spring
retainer. Make sure spring retainer is in flush with top
of bowl casting.
13. Install fuel filter relief spring, fuel inlet filter, filter
nut and gasket. Tighten to 25 lb. ft.
NOTE: Open end of filter should face hole in fuel inlet
nut.
14; Install float needle seat and gasket and tighten
securely using care not to damage needle seat.
15. Install float needle valve into needle seat.
16. Insert float hinee pin into float arm. Then install
float and hinge pin Into float bowl;
17. FLOAT LEVEL ADJUSTMENT (Fig.
6B-18)
a. Hold float retaining pin firmly in place and push
down on float arm at top of float needle.
b. With adjustable T-scale, measure distance from top
Fig. 68-18 Float Level Adjustment
of float at index point on toe, to float bowl gasket
surface (gasket removed).
NOTE: Gauge index point is raised portion on top of
fZoat at toe.
c. To adjust, bend the float pontoon up or down at
float a r m junction as shown.
18. METERING ROD ADJUSTMENT (Fig. 68-19)
a. Remove metering rod by holding throttle valve wide
open. Push downward on metering rod against spring
tension, then slide metering rod out of slot in holder
and remove from main metering jet.
b. To check adjustment, back out slow idle screw and
rotate fast idle cam so that fast idle cam follower is not
contacting steps on cam.
c. With throttle valve completely closed, apply pressure
to top of power piston and hold piston down against
its stop.
d. Holding downward pressure on power piston, swing
metering rod holder over flat surface of bowl
casting
next to carburetor bore.
BACK OVT
IDLE SPEED SCFfEW
HOLD THROTTLE VALVE
W g l E f E L Y
CLDSED
Fig. 68-19 Metering Rod Adjustment