TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
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2-108 Change 2 B4 KNOWN INFO FUEL SOLENOID AND WIRING OK FUEL RETURN LINES INJECTION PUMP INJECTORS RETURN CHECK VALVE POSSIBLE PROBLEMS TM 9-2320-280-20-1 FUEL SYSTEM DIAGNOSTIC FLOWCHART TEST OPTIONS Visual Inspection REASON FOR QUESTION Plugged fuel return lines cause back pressure which prevents injection pump from working properly. KNOWN INFO RETURN LINES OK INJECTION PUMP INJECTORS POSSIBLE PROBLEMS TEST OPTIONS Run Intake/Exhaust Tests Page 2-137. REASON FOR TESTS There is still a possible Intake/Exhaust fault. If you came here from Startability then this wasn’t tested. B5 NO YES Repair/Replace Fuel Injector Return Lines From B3 Page 2-106 DOES THE ENGINE RUN POORLY WITH THE RETURN LINE DISCONNECTED? RUN THE INTAKE/EXHAUST TESTS. RETURN HERE IF NO FAULTS FOUND. KNOWN INFO RETURN LINES OK INJECTION PUMP INJECTORS POSSIBLE PROBLEMS TEST OPTIONS Run Startability Test Page 2-41. Run Fuel System Test Page 2-95. REASON FOR TEST If all efforts have been exhausted, still experience no hot start problem, identify the fuel injection pump model and serial number. B6 RUN THE STARTABILITY TEST RUN THE FUEL SYSTEM TEST