TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 326 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

TANKER SYSTEM (CONT)

5. AUXILIARY PUMP WILL NOT PUMP FUEL (CONT).

Step 6. Check for defective auxiliary pump power wire. Remove auxiliary pump junction box cover

(para 7-48). Check resistance of red wire between relay terminal E3 and APC AUXILIARY

PUMP CONTROL switch.

If resistance is more than zero ohms, replace wire, install main, control, and

auxiliary pump junction box covers (paras 7-47, 7-48, and 7-49).

Step 7. Check for defective auxiliary pump relay ground wire. Disconnect blue wire from auxiliary

pump junction box and relay terminal A5. Check resistance of blue wire.

If resistance is more than zero ohms, replace wire, install main, control, and

auxiliary pump junction box covers (paras 7-47, 7-48, and 7-49).

Step 8. Connect batteries (para 7-91). Check for defective auxiliary pump relay. Set APC

AUXILIARY PUMP CONTROL switch to ON.

If AUXILIARY PUMP does not run, replace auxiliary pump relay (para 7-48),

install main and control junction box covers (paras 7-47 and 7-49).

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