SOFTWARE GP- 3858110 - Caterpillar

Illustration 1 g01095540
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 from the fuel transfer pump through a fuel filter before the fuel enters the fuel supply manifold. A fuel priming pump is located on the fuel filter housing in order to prime the system. The fuel system requires priming if the following conditions exist:
The fuel filters are changed.
The fuel supply manifold is drained.
The fuel return manifold is drained.
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.Fuel leaves the pressure regulating valve and the fuel is sent to a fuel cooler that is part of the radiator. The fuel then returns to the fuel tank.The electronically controlled mechanically actuated fuel system provides total electronic control of injection timing. The injection timing is varied in order to optimize the engine's performance.