HOSE AS 2391872 - Caterpillar

General Information
Illustration 1 g01165781
Fuel system schematic (typical example)
The fuel supply circuit is a conventional design for engines that use fuel injectors. The fuel supply circuit uses a fuel transfer pump to deliver fuel from the fuel tank to the electronic fuel injectors. The transfer pump is a fixed displacement gear pump.The fuel flows through a fuel filter before entering the fuel supply manifold. A fuel priming pump is located on the side of the engine in order to fill the system. The system must be primed after filter changes, after draining the fuel supply and return manifolds, and when the fuel injectors are replaced.The fuel flows continuously from the fuel supply manifold through the fuel injectors. The fuel flows when either the supply or the fill port in the injector is not closed by the injector body assembly plunger. The fuel that is not injected into the cylinder is returned to the tank through the fuel return manifold.A pressure regulating valve is at the end of the fuel return manifold. The pressure regulating valve controls the entire fuel system pressure. This provides proper filling of the fuel injectors.The electronically controlled mechanically actuated fuel injector system provides total electronic control of injection timing. The injection timing is varied in order to optimize the engine's performance.Duplex Fuel Filter
The duplex fuel filter system enables you to change the filter elements while the engine is running. The control valve allows fuel flow to be diverted to either the upper set of filters, to the lower set of filters, or to both sets of filters. Once the valve has been moved to allow fuel flow to the upper set of filters, the lower set of filters can be serviced. Refer to the Operation and Maintenance Manual for more information.
Illustration 2 g01166049
Typical example