TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download

2-106 Change 2 B1 KNOWN INFO ENGINE DOESN’T STAY RUNNING POSSIBLE PROBLEMS FUEL PUMP FUEL SUPPLY LINES FUEL RETURN LINES FUEL FILTER FUEL SOLENOID/WIRING HIGH PRESSURE SYSTEM Go to B4, page 2-108 TM 9-2320-280-20-1 FUEL SYSTEM DIAGNOSTIC FLOWCHART TEST OPTIONS STE/ICE Test 90, (page 2-751) Multimeter REASON FOR QUESTION Current through the wire quickly checks the integrity of the fuel system wiring. The normal reading will be about 1.3 to 1.5 amps. KNOWN INFO OTHER SYSTEMS LISTED ABOVE OK POSSIBLE PROBLEMS FUEL PUMP FUEL SUPPLY LINES FUEL RETURN LINES FUEL FILTER FUEL SOLENOID/WIRING HIGH PRESSURE SYSTEM KNOWN INFO FUEL PUMP OK FUEL SUPPLY LINES OK FUEL FILTER OK FUEL RETURN LINES FUEL SOLENOID/WIRING HIGH PRESSURE SYSTEM POSSIBLE PROBLEMS TEST OPTIONS STE/ICE Test 24, (page 2-738) Fuel Pump Volume Test REASON FOR QUESTION Positive pressure and volume indicate that fuel is present and supply lines and filter are not plugged. This is a test of the lift pump. TEST OPTIONS Put the return line in a suitable container and try starting the engine. REASON FOR QUESTION A restricted fuel return line will cause a pressure imbalance in the pump and prevent the engine from running. B3 B2 NO YES Go to N, Page 2-132 B From 2, Page 2-96 Disconnect the glowplug controller and wire 569B/569D from the injector pump. Make sure that wire 54A is properly connected to the injector pump. With the rotary switch in “RUN” position, do you have at least 0.5 amps DC flowing through wire 54A? Reconnect the above wires. Check fuel pump pressure and volume during cranking. Is pump pressure greater than 3 psi (20.69 kPa) and fuel volume at the injection pump inlet 1 pint in 30 seconds? Does the engine start and stay running with the fuel return line (the short rubber line at the injector pump) disconnected? NO YES Go to D, Page 2-112 NO YES Go to I, Page 2-126 !!