4. Fuel Supply

Fig. 4-1 is an exploded view showing the fuel tank, the fuel sender gauge, the expansion tank, and the tank vents. Fuel is drawn from the tank through a pickup tube in the fuel gauge sender assembly. Surplus fuel from the injection pump is returned to the tank, which also aids in warming the fuel during cold weather. Vents and the expansion tank compensate for expansion and contraction of the fuel volume.

When reinstalling the fuel tank after cleaning or repairs, it is important that the connections leading to the tank be installed correctly, without kinks and in their original locations. Errors can cause fuel starvation, a collapsed fuel tank, or faulty operation of the fuel injection system.

Fuel from the tank passes through a fuel filter and a water separator enroute to the injection pump in order to remove water and other harmful contaminants. The fuel filter, the water separator, and their connections are shown in Fig. 4-2. Information on maintenance of the water separator and the fuel filter can be found in LUBRICATION AND MAINTENANCE.

Fig. 4-1.

Exploded view of diesel fuel system, including fuel tank, expansion tank, fuel gauge sender, and vent hoses.

Fig. 4-2.

Fuel filter and water separator, showing connections and direction of fuel flow.