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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 (cent)
Step 8.
Step 9.
Step 10.
Step 11.
Step 12.
Step 13.
Step 14.
Step 15.
Disassemble fuel injection pump and check that metering valve is assembled correctly to metering valve
arm (para 4-3b; notify general support maintenance).
a. If metering valve is incorrectly assembled to metering valve arm, remove and install correctly
(para 4-3b).
b. If metering valve is correctly assembled to metering valve arm, proceed to step 9.
Disassemble fuel injection pump and check that cam is not installed backwards (para 4-3b; notify
general support maintenance).
a. If cam is installed backwards, remove and install properly (para 4-3b).
b. If cam is installed correctly, proceed to step 10.
Disassemble fuel injection pump and check cam roller shoes for burrs; also check for freedom of
rotation, chipping, and abrasive wear patterns (para 4-3b; notify general support maintenance).
a. Replace cam roller shoes if burred, sticking, chipped, or abrasive wear pattern observed
(para 4-3b).
b. If cam roller shoes check okay, proceed to step 11.
Check that thrust plunger is installed (para 4-3b; notify general support maintenance).
a. If thrust plunger is missing, install (para 4-3b).
b. If thrust plunger is installed, proceed to step 12.
Disassemble fuel injection pump and check transfer pump blades for wear or damage (para 4-3b;
notify general support maintenance).
a. If transfer pump blades are worn or damaged, replace (para 4-3b).
b. If transfer pump blades check okay, proceed to step 13.
Disassemble fuel injection pump and check for foreign matter in passage from transfer pump to
metering valve (para 4-3b; notify general support maintenance).
a. Remove foreign matter (para 4-3b).
b. If no foreign matter is present, proceed to step 14.
Check rotor for scores (para 4-3b notify general support maintenance).
a. If rotor is scored, replace it (para 4-3b).
b. If rotor is not scored, proceed to step 15.
Check that hydraulic head screws are tight or are not missing (para 4-3b; notify general support
maintenance).
3-21
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