FUEL PUMP PRESSURE ADJUSTMENT PROCEDURES.

3-1040-279-12&P

4-12 FUEL PUMP PRESSURE ADJUSTMENT PROCEDURES.

This task covers adjustment of fuel pump.

INITIAL SETUP

Tools

WARNING

General Mechanic's Automotive Tool Kit

SC 5180-90-CL-N26

FUEL SPRAY is very flammable. Do not allow

Test Equipment

open flames, sparks, or heated objects in the

Fuel Test Gage (Fig. G-22, App G)

area during procedure. Point nozzle assem-

bly away from personnel and smoke generator.

Equipment Condition

Vehicle Engine Running

1. Disassemble cover assembly (P. 4-36).

2. Remove cap (1) from FUEL TEST POINT, and attach fuel test gage (Fig. G-22, App G), to fitting

(2).

3. Remove eight screws (3) and washers (4) and remove equipment container panel (5).

4. Set ENGINE switch on terminal bracket assembly to ON.

5. Remove nozzle assembly from engine head.

6. Place nozzle assembly in suitable container to collect fuel.

7. Set circuit breaker CB1, and POWER switch to ON.

8. Hold FUEL switch on control panel to START position until FUEL indicator lights then release

switch to RUN position.

9. Set ENGINE switch to RUN position. Check fuel test gage. Pressure should be 100 5 psig.

If not:

a. Set control panel switches to OFF.

b. Remove cap nut (6) from fuel pump assembly (8).

c. Turn adjuster (9) clockwise to increase pressure, turn adjuster counterclockwise to reduce

pressure (one turn equals 10 psi).

d. Replace cap nut and repeat steps 7, 8 and 9.

10. After setting pressure, set FUEL, ENGINE, and POWER switches on control panel to OFF.

11. Set circuit breaker CB1 POWER switch, on control panel and ENGINE switch on terminal

bracket to OFF.

12. Remove fuel test gage and install cap.

13. Position equipment container panel (5) and secure with eight screws (3) and washers (4).

14. Reassemble cover assembly (P. 4-37).

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