TURBOCHARGER GP 4177600 - Caterpillar

Any time the fuel flow is broken and air is allowed to get into the fuel system, the fuel system must be primed. If air is left in the lines, the fuel system may become air bound, resulting in inability to start the diesel engine or the mis-firing of one or more cylinders. Priming The Fuel System - Direct Electric or Air Starting Motor: Priming the fuel system will allow the fuel priming pump to force air and fuel through the fuel filters and the fuel injection pump vents if the engine is level. Prime the system as follows:1. Check to see that the diesel fuel tank valve is open.
FUEL FILTER VENT VALVE2. Move the governor control lever to the stop position, so the fuel injection pumps are closed.3. Open the fuel filter vent valve.4. Loosen the knurled top (1) of the fuel priming pump and operate the pump plunger up and down until fuel flows from the fuel filter vent valve. Continue to operate the fuel priming pump until the flow of fuel from the vent valve becomes continuous and contains no air bubbles.
FUEL PRIMING PUMP
1-Knurled top.5. Open and close the vent valve several times to be sure that all the air is bled from the system. Close the vent valve.6. Tighten the knurled top of the fuel priming pump to its original position. Priming The Fuel System - Gasoline Starting Engine: Priming the fuel system will allow the fuel transfer pump to force air and fuel through the fuel filters and the fuel injection pump vents if the engine is level. Prime the system as follows:1. Check to see that the diesel fuel tank valve is open.2. Move the governor control lever to the stop position, so the fuel injection pumps are closed.3. Move the compression release lever to the START position.4. Start the starting engine, engage the starter pinion and clutch. Allow the starting engine to crank the diesel engine at starting engine low idle speed.
FUEL FILTER VENT VALVE5. Open the fuel filter vent valve. When the flow of the fuel from the fuel vent drain tube is continuous and contains no air bubbles, close the vent valve.6. Open and close the vent valve several times to be sure all air is bled from the system.