TM 9-2320-361-20 3-29. SECONDARY AND FINAL FUEL FILTERS TESTING AND MAINTENANCE This task covers: a. Testing Fuel Pressure e. Cleaning and Inspection b. Draining f. Fuel Filters Installation c. Fuel Filter Head, Secondary, and g. Fuel Filter Head, Secondary, and Final Fuel Filters Removal Final Fuel Filters Installation d. Fuel Filters Removal h. Bleeding Air INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM) All TM 9-2320-361-10 TEST EQUIPMENT TM 9-2320-361-20P Fuel pressure gage, NSN 4910-00-225-8673 EQUIPMENT CONDITION MATERIALS/PARTS Parking brake set (TM 9-2320-361-10). Hood raised and secured (TM 9-2320-361-10). Three lockwashers Four washers GENERAL SAFETY INSTRUCTIONS Six gaskets Diesel fuel is flammable. Do not perform fuel Two filter elements system procedures near flames. Two cotter pins Keep fire extinguisher nearby when using Rag (Appendix C, Item 21) drycleaning solvent. Drycleaning solvent (Appendix C, Item 26) a. Testing Fuel Pressure WARNING Diesel fuel is flammable. Do not perform fuel system procedures near open flame. Injury or death to personnel may result. NOTE Fuel filters may have either one or two bleeder valves. Remove only one bleeder valve for testing fuel pressure. 1. Remove bleeder valve (1) or (4) from top of fuel filter head (5). 2. Install adapter (3) and fuel pressure gage (2). CAUTION Do not start engine. Starting engine may damage fuel pressure gage. 3. Turn accessory switch to ON position (TM 9-2320-361-10) to start fuel pump. 4. Read pressure on fuel pressure gage (2). If pressure reads at least 2 psi (13.8 kPa), condition of all fuel filters is satisfactory. If not, turn accessory switch to OFF position (TM 9-2320-361-10) and inspect for damaged fuel supply tubes (9) and, if necessary, replace primary fuel filter (para. 3-28). If pressure is still not at least 2 psi (13.8 kPa), continue with task b. to replace secondary and final fuel filter. 3-54