LOW FUEL PRESSURE (Cont)

TM 9-2320-285-24-1

2-9.

FUEL SYSTEM TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

LOW FUEL PRESSURE (Cont)

Step 3.

Replace primary and secondary fuel filters (para 2-13c); be sure to fill fuel filters 2/3 full with clean diesel

fuel. Start engine and operate at 1200 rpm for 15 to 20 minutes. Loosen filters one at a time and check

if filter is full of fuel.

If filters are not full of fuel, this indicates an air leak between filters and fuel tank; remove and inspect

fuel lines and fittings (para 2-13b(2)); replace if damaged (para 2-13b(2)).

If fuel filters are full of fuel, go to step 4 below.

Step 4.

Disconnect fuel return hose (para 2-13b(l)) from fuel tank. Place open end of hose in a five gallon

container. Start engine and operate at 1200 rpm. Hold end of fuel return hose under fuel in container.

Check for air bubbles rising to surface of fuel in container.

If air bubbles are observed, tighten fuel line connections between secondary fuel filter and fuel pump

If air bubbles are not observed, notify direct support maintenance (refer to TM 9-2815-205-34 for

troubleshooting of the engine and its components).

EXCESSIVE FUEL USAGE

WARNING

Diesel fuel is highly combustible. Do not smoke or allow open flames or sparks into the area. Death or

severe injury may result if personnel fail to observe this precaution. If you are burned, obtain medical aid

immediately.

Step 1.

Check fuel lines for leakage or damage.

If fuel lines are leaking or damaged, replace (para 2-13b(2)).

If fuel lines are not leaking or damaged, go to step 2 below.

Step 2.

Check fuel tank for leakage or damage.

If fuel tank is leaking or damaged, replace (para 2-13b(l)).

If fuel tank is not leaking or damaged, go to step 3 below.

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