TM 5-2420-231-23-1
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FUEL SYSTEM PRIME PROCEDURE
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WARNING
Diesel fuel is combustible and an irritant. Skin and eye protection is required. Ensure work
area is well ventilated.
Keep away from open flame and other ignition sources.
Fire extinguishers should be placed nearby.
Failure to follow these warnings may result in injury or death to personnel.
CAUTION
Damage to the high-pressure fuel pump, batteries, or starter motor can occur if starter
motor is used excessively to eliminate air from fuel system.
NOTE
If air enters the fuel system, it must be removed before the engine can be started. Air can
enter the system if:
Fuel tank is drained during normal operation.
Low-pressure fuel tubes/hoses are disconnected.
Low-pressure fuel system leaks during engine operation.
Fuel system opened for service of individual components.
High-pressure fuel tubes disconnected.
1. Open low-pressure fuel pump purge (Figure 25, Item 1) on fuel filter housing (Figure 25, Item 2).
2. Operate fuel pump lever (Figure 25, Item 3) until air is purged from fuel filter housing (Figure 25, Item 2).
3. Tighten low-pressure fuel pump purge (Figure 25, Item 1) on fuel filter housing (Figure 25, Item 2).
Figure 25. Fuel Pump Purge.
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