HOOD AS 2170018 - Caterpillar

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Typical exampleThe primary filter/water separator (1) is located between the electric transfer pump and the secondary fuel filter. The primary filter/water separator (1) provides a 10 micron filtration level.The primary filter/water separator can either be engine mounted or supplied loose. The primary filter/water separator is supplied with water in fuel sensor (2) .Secondary Fuel Filter
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Typical exampleThe secondary fuel filter (1) is located after the primary fuel filter. The secondary fuel filter (1) provides a 4 micron filtration level.Fuel Pump Assembly
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Typical exampleThe fuel pump assembly consists of a low-pressure transfer pump and a high-pressure fuel injection pump. The pump assembly is driven from a gear in the front timing case at engine speed. The fuel injection pump (1) has three plungers that are driven by a camshaft. The fuel injection pump (1) delivers a volume of fuel three times for each revolution. The stroke of the plungers is fixed.The injector will use only part of the fuel that is delivered by each stroke of the pistons in the pump. The suction control valve (3) for the fuel injection pump (1) is controlled by the ECM. This valve maintains the fuel pressure in the fuel manifold (rail) at the correct level. A feature of the fuel injection pump (1) allows fuel to return to the tank continuously.The fuel temperature sensor (2) measures the temperature of the fuel. The ECM receives the signal from the fuel temperature sensor (2) . The ECM calculates the volume of fuel.The fuel injection pump has the following operation:
Generation of high-pressure fuelThe fuel output of the fuel injection pump is controlled by the ECM in response to changes in the demand of fuel pressure.Shutoff
The engine shuts off by preventing the electronic unit injectors from injecting. The ECM then closes the suction control valve to prevent the pressure in the fuel manifold (rail) from increasing.Control
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Typical example of the electrical control system for the fuel system (1) Electronic Control Module (ECM) (2) Throttle position sensor (3) Wastegate regulator (4) Fuel rail pressure sensor (5) Inlet manifold pressure sensor (6) Atmospheric pressure sensor (7) Coolant temperature sensor (8) Inlet manifold air temperature sensor (9) Secondary speed/timing sensor (10) Primary speed/timing sensor (11) Fuel injection pump (12) Suction control valve for the fuel injection pump (13) Fuel temperature sensor (14) Electronic unit injectorsThe ECM determines the quantity, timing, and pressure of the fuel in order to be injected into the fuel injector.The ECM uses input from the sensors on the engine. These sensors include the speed/timing sensors and the pressure sensors.The ECM controls the timing and the flow of fuel by actuating the injector solenoid.The amount of fuel is proportional to the duration of the signal to the injector solenoid.The ECM controls the fuel pressure by increasing or decreasing the flow of fuel from the fuel injection pump.Fuel Injectors
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Typical example (1) Electrical connections (2) Bolt (3) Clamp (4) Combustion washer (5) O-ring (6) Fuel inletNote: If a replacement electronic unit injector is installed, the correct