SPACER 4C1335 - Caterpillar

Prime the fuel system in order to fill dry fuel filters and purge air from the fuel system. Prime the fuel system after the following occurrences:
Running the fuel system dry
Removal of the engine from storage
Maintenance of the fuel filter
Disconnecting fuel lines and installing fuel lines
Repair of leaks in the fuel lines
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.
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 disconnected fuel system component.
Unlock and operate the priming pump plunger until a resistance is felt. This may require a considerable number of strokes.
Push in and hand tighten the priming pump plunger.
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. The engine may run rough. Run the engine at low idle until the engine runs smoothly. If the following conditions exist, repeat Steps 1 through 3:
The engine will not start.
The engine starts but the engine continues to misfire.
The engine starts but the engine continues to smoke.If operating problems persist after repeating Steps 1 through 3, proceed to Step 4.
Illustration 1 g00502366
(1) Vent plug
(2) Fuel injection pump housing
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
Loosen vent plug (1) on fuel injection pump housing (2).
Unlock and operate the priming pump plunger until the flow of fuel from the vent valve is continuous and free of air bubbles.
Tighten the vent plug. Clean up any spilled fuel immediately.
Push in and hand tighten the priming pump plunger.
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. The engine may run rough. Run the engine at low idle until the engine runs smoothly. Proceed to Step 9 if the following conditions exist:
The engine will not start.
The engine starts but the engine continues to misfire.
The engine starts but the engine continues to smoke.
Illustration 2 g00496813
Do not let the tops of fuel nozzles turn when the fuel line nuts are loosened or tightened.The nozzles will be damaged if the top of the nozzle turns in the body.The engine will be damaged if a defective fuel injection nozzle is used because the shape of fuel (spray pattern) that comes out of the nozzles will not be correct.
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
Loosen one fuel injection line nut at the fuel injection nozzle.
Unlock and operate the priming pump plunger until the flow of fuel from the fuel injection line is continuous and free of air bubbles.
Tighten the fuel injection line nut. Refer to Specifications for the proper torque. Clean up any spilled fuel