TM 9-2320-361-20 Table 2-2. Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 5. Check fuel pump discharge. a. Remove fuel line from fuel pump output (para. 14-4). b. Use clean container for fuel discharge recovery. c. Position heater control box to RUN position. d. If fuel pump fails to pump adequate amount of fuel, 1/2-pint (0.24 liter) in 30 seconds, replace (para. 14-4). Step 6. Inspect exhaust system for restrictions. If exhaust pipe is restricted or damaged, repair or replace (para. 14-6). Step 7. If fuel burning heater still fails to operate, replace fuel burning heater (para. 14-2). Step 8. Check for proper operation of defroster and heat diverter control cables (TM 9-2320-361-10). If control cables or vent are broken, replace (paras. 11-40 and 11-41). END OF TESTING! 2-51