HARNESS AS-ENGINE 2615678 - Caterpillar

Primary and Secondary Fuel Filter Base
Illustration 3 g06330435
Typical example
The primary and secondary fuel filter base is supplied loose and is mounted to the application.The primary and secondary fuel filter base contains the following components:
Primary filter/water separator
Electric fuel transfer pump
Secondary fuel filterThe primary filter/water separator (1) is supplied with water in fuel sensor (4).The secondary fuel filter (3) is located after the primary fuel filter (1) and the electric fuel transfer pump (2).Fuel Pump Assembly
Illustration 4 g02216343
Typical example
The 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
Illustration 5 g02210619
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 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
Illustration 6 g02290433
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 injector code must be programmed into the electronic control module. Refer to Troubleshooting, "Injector Code - Calibrate" for more information. The code that is required is located at Position (X). Record Code