FUEL DELIVERED FROM TRANSFER PUMP BUT NOT TO FUEL INJECTORS

TM 10-3930-638-24&P

3-4. FUEL SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

11. FUEL DELIVERED FROM TRANSFER PUMP BUT NOT TO FUEL INJECTORS

Remove governor control cover (para 4-3b; notify general support maintenance) and check solenoid

Step 1.

frame and arm assembly for cracks and swelling in encapsulated material and looseness of screw

terminals. Check continuity using an ohmmeter (para 4-3b; notify general support maintenance).

a. If cracks, swelling or loose screw terminals are observed, replace solenoid frame and arm

assembly (para 4-3b); if continuity not obtained, replace solenoid frame and arm assembly

b. If solenoid frame and arm assembly checks okay, proceed to step 2.

Step 2.

Disconnect fuel lines from fuel injection pump at fuel injectors (para 3-6a) one at a time, crank engine

and check that fuel is pumped out of disconnected fuel line.

a. If fuel is not pumped out of disconnected fuel line when engine is cranked, replace associated

connector screw (para 4-3b; notify general support maintenance).

b. If fuel is pumped out of disconnected fuel line, proceed to step 3.

Step 3.

Disassemble fuel injection pump and check governor linkage for binding, foreign matter, and burrs;

check metering valve for sticking condition (para 4-3b notify general support maintenance).

a. If linkage is binding or burred, replace (para 4-3b); if foreign matter is present, remove; if

metering valve is sticking, replace (para 4-3b).

b. If linkage and metering valve check okay and no foreign matter present, proceed to step 4.

Step 4.

Remove plungers and inspect for burrs, corrosion or varnishes (para 4-3b; notify general support

maintenance).

a. If plungers are burred, corroded, or varnish accumulation is present, replace (para 4-3b).

b. If plungers are okay, proceed to step 5.

Inspect governor linkage for breaks or cracks (para 4-3b; notify general support maintenance).

Step 5.

a. If governor linkage is broken or cracked, replace and adjust (para 4-3b).

b. If governor linkage checks okay, proceed to step 6

Disassemble fuel injection pump and check governor parts and linkage for wear, sticking condition,

Step 6.

or binding (para 4-3b; notify general support maintenance).

a. If governor parts and linkage are worn, sticking, or binding replace (para 4-3b).

b. If governor parts and linkage are okay, proceed to step 7.

Step 7.

Check adjustment of torque screw (para 4-3b; notify general support maintenance).

a. If torque screw out of adjustment, adjust (para 4-3b).

b. If torque screw adjustment is okay, proceed to step 8.