Pontiac tempest 1968 Service Manual page 329

6 B - 2 2
1968 P O N T I A C SERVICE MANUAL
5. Replace pump inlet strainer, pressing care
fully into position.
ASSEMBLY OF BOWL COVER
1. Install choke shaft in air horn, then install
choke valve on choke shaft, using two attaching
screws. Letters R P on choke valve should face
towards top of air horn. Center choke valve before
tightening screws, by installing the fast idle lever
and choke trip lever. Maintain approximately .020"
clearance beween the fast idle lever and air horn
casting. Then tighten choke valve screws and stake
lightly. Then install choke trip lever and fast idle
lever. Choke valve should move freely in housing.
2. Replace pump outer lever and shaft assembly
and inner lever, tighten retaining screw on inner
lever.
3. Install small fuel screen on needle seat.
4. Install float needle seat screen and gasket,
using wide blade screwdriver.
5. Drop aluminum pump intake ball check into
shaft end pointing inward towards center of air
horn casting.
6. Install cover gasket.
7. Insert needle in seat, carefully position float
and insert hinge pin.
8. Check float level and drop adjustments.
FLOAT LEVEL ADJUSTMENT (Fig. 6B-50)
With air horn inverted, gasket in place and needle
seated, there should be 9/16"± 1/32" clearance be­
ween the lip of the float at toe end and air horn
gasket.
Fig. 6B-51 Float Drop Adjustment
Use gauge set J 8556. To adjust, bend float arm at
rear of float. Visually check float alignment after
adjusting float.
FLOAT DROP ADJUSTMENT (Fig. 6B-51)
With air horn right side up so that float can hang
free, the distance from gasket surface to lip of
float should be a minimum of 1 3/4". Maximum drop
can be any amount that will retain needle for in­
stallation. Needle must not wedge at maximum drop.
To adjust, bend tang at rear of float towards needle
seat to decrease float drop and away from needle
seat to increase float drop.
1. Install power piston in vacuum cavity; piston
should travel freely in cavity. Stake vacuum piston
retainer washer.
2. Place cover on bowl, making certain that ac­
celerator pump plunger is correctly positioned and
will move freely.
MEASURE FROM TOP
OF AIR HORN RING TO
TOP OF PUMP ROD
Fig. 6B-50 Float Level Adjustment
Fig. 6B-52 Pump Rod Adjustment