TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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Model Pump P/N (NSN) Serial Number Break Original P/N New P/N (NSN) DB2829-4523 7539307 23122 or 28396 31816/4320-01-317-0692 (2910-01-199-2355) DB2829-4879 80644583 23122 or 28396 31816/4320-01-317-0692 (2910-01-326-9221) DB2831-5149 776848 29124 31506/2910-01-414-5382 (2910-01-414-1272) DB2831-5149 776848 29124 31506/2910-01-414-5382 (2910-01-434-8597) TM 9-2320-280-20-1 REFERENCE INFORMATION FUEL SYSTEM Change 2 2-109 Return lines should be inspected for kinks or crushed lines or anything that might restrict fuel flow. Inspect fuel return check valve for any restrictions. Replace valve (para. 3-35). Replace fuel lines. Refer to (para. 3-25). If you came here from the Startability Tests, return to STEP 5, Page 2-44. If you haven’t run the Startability Tests yet, go to STEP 1, Page 2-42. During high temperature and humidity, early model vehicles can experience difficulty starting while using JP-8 fuel. High temperatures can cause restrictive clearances in some older fuel injection head and rotor assemblies. The engine must be allowed to cool to allow adequate clearance of the pumping plungers to ensure adequate fuel delivery for starting. If this condition persists, run the startability tests. If vehicle passes all startability tests and troubleshooting procedures and still experiences difficulty in hot starting, identify the fuel injection pump and serial numbers. All fuel injection pumps with P/N DB2831-5209, NSN 2910-01-467-9029 incorporated the improved head and rotor assembly, P/N 31506. If your serial number is less than shown in the Serial Number Break Column of the table below, the manufacturer recommends the fuel injection pump to be replaced, tagged as a “no hot restart” condition, and forward for rebuild. Notify direct support maintenance.