TM 5-2410-240-23-1
0026
LOW PRESSURE FUEL SYSTEM TEST
00026
There are six fuel injectors mounted on the cylinder head. Fuel injectors are electromechanical devices. High-
pressure fuel is continuously available to each injector. The engine Electronic Control Module (ECM) determines
the correct time and duration to activate each injector. Refer to WP 0003 for detailed description of fuel system.
N OT E
This procedure will test the low pressurefuel system through the transfer pump.
Low pressure fuel system should not be te ted during cranking. Fuel pressures will vary
s
and be inconsistent.
Prime fuel system for 30 seconds if engine does not run.
1. Remove plug and O-ring (Figure 4, Item 2) from secondary fuel filter base (Figure 4, Item 1).
2. Connect nipple and adapter to secondary fuel filter base (Figure 4, Item 1), and install pressure gauge on
nipple.
3. Start engine and run at 1,000 rpm.
4. Check fuel pressure on gauge. Pressure should be 44 to 80 psi (300 to 550 kPa). Repeat test to verify
pressures.
a. If fuel pressure is more than 87 psi (600 kPa), there is a problem with pressure regulator for fuel injection
pump. Replace fuel injection pump (WP 0075).
b. If pressure is less than 44 psi (303 kPa), check for restrictions in low pressure fuel lines between fuel
injection pump and secondary fuel filter base. If no faults are found, replace fuel injection pump (WP
0075).
Figure 4. Low Pressure Fuel System Test Port.
0026
END OF TASK
