Jeep UNIVERSAL CJ-2A - Page 109

F
FUEL SYSTEM
When the windshield wiper motor is turned on, but
manifold vacuum is greater than the vacuum
created by the booster pump, air flows from the
wiper motor through both valves of the vacuum
booster. As manifold vacuum drops off as a result
of the engine operating under low speed and high
load, the vacuum created by the vacuum booster
will be greater than engine intake manifold vacuum
and :the pump will operate the wiper motor when
the wiper control switch is turned on.
Refer to Fig. 131.
Remove the eight cover attaching screws and
1ockwashers, and remove the cover, diaphragm
spring and spring seat. Detach the diaphragm rod
from the rocker arm and remove the diaphragm.
The valve assemblies are pressed into the cover
and body and lightly staked. They may be removed
with the point of a knife blade. If installing new
valves be sure the inlet and outlet valves are
correctly positioned and stake them lightly with
a small punch.
Assemble the vacuum pump in the reverse order
of disassembly, drawing the cover attaching screws
up evenly and tightly.
F -43. Fuel Pump Testing
Four tests are presented in following paragraphs to
test for proper operation of the fuel pump. In addi-
tion, check the following:
a. Check for secure mounting of the fuel pump.
The rocker arm may be working the entire pump
up and down, rather than just the pump dia-
phragms.
b. Remove and clean the fuel sediment bowl.
c. Check all fuel lines.
F-44. Volume·Check
To measure fuel pump capacity (amount of fuel
delivered in a given time) di:sconnect the pump-to-
carburetor line at the carburetor end. Place the
open end of the line in a suitable container. Start
the engine and operate at normal idle speed.
Delivery should be one quart U.S. [1 ltr.] within
one minute.
F -45. Pressure Check
To measure fuel pump pressure (force of fuel de-
livery) disconnect the pump-to-carburetor line
at the carburetor end. Plug a pressure gauge and
T-fitting into the open end of this line and into the
carburetor. Start the engine and operate at normal
idle speed. Pressure should be 2 ~ to 3%: psi.
[0,716 a 0,264 kg-cm2] at 1800 rpm. and at 16n
[406 mm.] above the outlet.
F-46. Vacuum Check
To measure fuel pump vacuum (pull of the pump
at the inlet side) disconnect the pump-to-fuel-tank
10857
FIG. 134-ACCELERATOR LINKAGE-CJ-2A, CJ-3A
108
1-Choke Control
2-Throttle Control ·
3-Adjueting Rod
4-Adjuating Rod Block
5-Throttle Wire Stop
6-Retracting Spring Clip
7-Retracting Spring
8-Retracting Spring Clip
9--8haft and Lever
10-Cross Shaft Lever
11-connectioli Link
12-Foot Rest
13-Accelerator Treadle
14-Pedal Hinge