VALVE GP-RELIEF 1170160 - Caterpillar

Priming the fuel system fills the fuel filter. Priming the fuel system removes air bubbles from the fuel system. Prime the fuel system under the following conditions:
Fuel system that is run dry
Storage
Fuel filter maintenance
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.
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
Illustration 1 g00464247
Top view (1) Vent valve (2) Fuel injection line nuts
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.
Open vent valve (1) on the fuel injection pump and turn on the fuel tank supply valve.
Unlock and operate the priming pump plunger until the flow of fuel from the vent valve is continuous and free of air bubbles.
Close vent valve (1) and lock the priming pump plunger. Ensure that any spilled fuel is cleaned up.
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 engine will not start, further priming may be necessary. If the engine starts and the engine continues to misfire or smoke, further priming may be necessary.If further priming is necessary, perform Steps 5 through 9 .
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.
Loosen fuel injection line nuts (2) at the cylinder head.
Unlock and operate the priming pump plunger until the flow of fuel from the fuel injection lines is continuous and free of air bubbles.
Lock the priming pump plunger.
Tighten the fuel injection line nuts (2) . Refer to Specifications for more information on the proper torques. Ensure that any spilled fuel is cleaned up.
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.