TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 163 of 1275

TM9-2350-311-20-1

CONTINUED FROM STEP A

B

1. Remove fuel pressure transducer at

secondary fuel filter (para 6-7).

2. Install appropriate pressure gage (para 6-7).

3. Start engine and run at idle

(TM 9-2350-31 1-10). Pressure should be

40 to 70 psi (276 to 483 kPa) at 1500 to 2300

rpm.

Is fuel pressure below 40 psi (276 kPa)?

Go to step F.

1. Install fuel pressure transducer at secondary

fuel filter (para 6-7).

2. Place a 100 psi (690 kPa) gage with a tee

fitting in the primary fuel filter inlet.

3. Disconnect connector from the fuel pump

relay.

4. Place a jumper wire from socket A to socket

c.

5. Turn MASTER switch ON and check gage.

Is fuel pressure at least 4 psi (28 kPa)?

I

Troubleshoot MASTER WARNING

light circuit.

I

Are fuel lines free of leaks and/or restrictions?

Tighten lines that leak. If leaks persist,

replace lines. Repair or replace

restricted lines.

CONTINUED ON NEXT PAGE

3-63