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 1226 of 1275

TM 9-2350-311-20-1

Verify that there is fuel in tank (TM 9-2350-311-10).

If fuel filters have been changed or fuel tank has run dry,

notify support maintenance.

Drain any water from primary fuel filter and continue to drain until

fuel appears (para 6-6).

Check for kinked, flattened, or broken fuel lines from tank to

filters and engine (para 6-1).

Check for blockage in quick disconnect fittngs (para 6-1).

Check pumps to make sure they are in working order (para 6-5 and

6-6).

Check fuel shutoff (para 5-8).

On some vehicles that have MASTER switch in negative battery cable, sparking may occur if VTM case

touches vehicle while MASTER switch is off and VTM power is on. Sparking in presence of fuel or vapors

presents potential hazard. Avoid hazard by doing all testing with vehicle MASTER switch on.

CAUTION

Before opening fuel line, make sure that area around fuel line is clean. Operation of

engine with red-striped transducer, TK item 22, installed could damage transducer.

During this test, be prepared to shut off fuel immediately if engine starts. Remove

transducer before attempting to start engine.

Excessive pressure can damage transducer. Pressure being measured should not

exceed -15 to +25 psig (-1.0 to +1.7 kg/sq cm).

Go to Figure 3,

sheet 24.

Figure 3, Sheet 23 of 36

I-49

WARNING