VALVE AS-CONTROL 3R4825 - Caterpillar

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Prime the fuel system in order to fill the fuel filter. Prime the fuel system in order to purge trapped air. The fuel system should be primed under the following conditions:
Running out of fuel
Storage
Replacement of the fuel filterEngines that are Equipped with a Fuel Priming Pump
Illustration 1 g00516899
(1) Select knob
(2) Plunger
Turn select knob (1) counterclockwise until the indicator is in line with the body of the priming pump.
Unlock the plunger and operate the plunger until a resistance is felt. A considerable number of pump strokes may be required.
Push in plunger (2) and tighten by hand.
Turn select knob (1) clockwise until the indicator is in line with the fuel outlet.
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Promptly start the engine. If the engine runs rough, increase the engine rpm to one half of the rated rpm. Note: If the engine will not start, further priming may be necessary. If the engine continues to misfire or smoke after starting, further priming may be necessary.Engines that are Not Equipped with a Fuel Priming Pump
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over any disconnected fuel system components.
If the engine is not equipped with a fuel priming pump, it may be necessary to fill the fuel filter with clean fuel. The following procedure will only allow filtered fuel to enter the fuel system.
Illustration 2 g00516900
(1) Plug
(2) Fuel filter
Remove plug (1) in order to fill fuel filter (2). Ensure that air is able to vent from the fitting of the plug while the fuel filter is being filled. Clean up any spilled fuel immediately. Clean plug (1). Install plug (1).
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Start the engine and immediately increase the engine rpm to one half of the rated rpm.
Maintain the engine rpm until the engine operates smoothly.
Reduce the engine rpm to low idle.