TM10-3930-660-20 Table  2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION Step 2. Check for restrictions in intake air and exhaust systems. a. Remove and clean air cleaner intake cap. Clean air inlet tube. Step 3. Step 4. Step 5. b. Remove and clean tail pipe. Check for air in the fuel system or inadequate fuel supply. Check the flow through the fuel filter and bleed the system, para. 5-12. Locate and correct the air leak. Check for fuel waxing due to extremely cold weather. Inspect the fuel filter, para. 5-16. Clean the system and use climatized  fuel. Check for contaminated fuel. Verify by operating the engine with clean fuel from a temporary supply  tank. Drain and flush the fuel/hydraulic tank, para. 5-10. 2-29