TM 5-3805-262-203-5. FUEL SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. LOW FUEL PRESSURE (Cont).Step 2.(Cont).Using compressed air,clear any blockage fromt u b e .Reconnect tube fittings toelbows and tightens e c u r e l y .Remove plug from elbowi n s t a l l e d i n f u e l i n j e c -tion pump.Connect a zero to 50 psipressure gage to elbowport from which plug wasremoved (port is 1/8NPTF).Bleed air from fuel system(page 4-40).Tell assistant to crank engine for 30 seconds while you watch pres-sure gage.Pressure gage should indicate 20 to 30 psi.a. If pressure gage indicates 20 to 30 psi, troubleshooting is com-p l e t e . Problem was ina n d f i l t e r h e a d .b. If pressure gage doesbelow.tube between fuel injection pump feed pumpnot indicate 20 to 30 psi, go to step 3Step 3.Replace fuel filters (page 4-38).Bleed air from fuel system (page 4-40).Tell assistant to crank engine for 30 seconds while you watch pres-sure gage.Pressure gage should indicate 20 to 30 psi.a. If pressure gage indicates 20 to 30 psi, troubleshooting is com-plete. Problem was in fuel filters.b. If pressure gage does not indicate 20 to 30 psi, go to step 4below.3-44
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