Lull 944E-42 Operation Manual - Manual (Page 123)

General Maintenance
121 Model 944E Origin 3/04
D. Bleeding Fuel System
Air must be vented from the fuel system whenever any component between the fuel
tank and the injection pump has been disconnected, or when the system has been
emptied or run out of fuel.
IMPORTANT! DO NOT attempt to start the engine until the injection pump has been
filled and primed with fuel. Serious damage to the lift pump will result due to lack of
proper lubrication.
1. To vent the low pressure lines and fuel filter, open the vent screw (5)
located on the filter head.
2. Operate the hand plunger (6) on the lift pump (2) until fuel flowing from the
fitting is free of air.
3. Tighten the vent screw (5) and torque to 7 lb-ft (9 Nm).
The process to vent the high pressure fuel lines involves energizing the starter motor
to rotate the crankshaft which will, in turn, pump any unwanted air from the fuel lines.
WARNING:
DO NOT bleed the fuel system of a hot engine.
Doing so could create a fire hazard. Allow the engine to cool before
bleeding the fuel system.
CAUTION:
When using the starting motor to vent the fuel system,
DO NOT energize the starter solenoid or crank the engine for more than
15 seconds at a time; wait two minutes between engagements.