TM 5-2420-230-24-2
roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-52
Section TS - Troubleshooting Symptoms
Engine Starts But Will Not Keep Running
This is symptom tree T072.
Cause
Correction
Fill the supply tank. Refer to the OEM service
Fuel level is low in the tank
.......
manual.
OK
E
Check for added loading from malfunctioning
accessories or other engine-driven units,
ngine under excessive load
.......
brakes dragging, or other changes in vehicle
loading. Disengage engine-driven units.
OK
F
Inspect the fuel shutoff valve (FSOV) hold coil
uel shutoff valve malfunctioning
.......
resistance and supply voltage. Refer to
Procedure 005-043.
OK
I
Check and adjust the low idle screw. Refer to
dle speed is set too low for accessories
.......
Procedure 005-029.
OK
A
Check for air in the fuel system. Repair source
ir in the fuel system
.......
of leak and bleed air from the system. Refer to
Procedure 006-003.
OK
F
Check the flow through the fuel filter. Replace
the fuel filter if necessary. Refer to Procedure
uel filter or fuel inlet restriction
.......
006-015. Clean all prefilters and screens.
Check the fuel suction line for restriction.
OK
F
Check the fuel heater, if installed. Weather
uel is waxing due to cold weather
.......
conditions sometimes require a fuel heater.
OK
E
Drain the fuel water separator and replace the
xcessive water in the fuel filter
.......
fuel filter. Refer to Procedure 006-015.
OK
T
(Continued)
L-636
