PIN 6G7773 - Caterpillar

Illustration 1 g00767186
(1) Primary Engine Crankshaft position sensor (2) Secondary Engine Camshaft position sensor (3) Injectors (4) Engine boost pressure Sensor (5) Fuel pump (6) 2 Micron secondary fuel filter (7) Primary fuel filter and water separator (8) Fuel tank (9) Fuel pressure regulator (10) Atmospheric pressure sensor (11) Engine oil pressure sensor (12) Engine coolant temperature sensor (13) Intake air temperature sensor (14) Engine fuel temperature sensor (15) Engine coolant level sensor (16) PTO on/off & set/resume switches (17) Throttle position sensor (18) Timing calibration connector (19) SAE J1939 Data Link (20) Warning lamp (21) Diagnostic lamp (22) Programmable outputs (23) CDL (24) ECM (25) Key Switch Input (26) Batteries (27) Fuel supply railThe Electronic Unit Injector system consists of the following systems: the mechanical system and the electronic system. The mechanical system is made up of the low pressure fuel supply system and the electronic unit injectors. The electronic system provides complete electronic control of all engine functions. The electronic control system consists of the following three types of components: input, control and output. Most changes to engine horsepower or to the performance are accomplished by installing new electronic software or upgrading mechanical components.There are five major components of the Electronic Unit Injector fuel system:
Electronic Unit Injectors
Fuel Transfer Pump
Electronic Control Module
Sensors
ActuatorsThe Electronic Unit Injectors produce fuel injection pressures up to 207000 kPa (30000 psi). The Electronic Unit Injectors also fire up to 19 times per second at rated speed. The fuel transfer pump supplies the injectors by drawing fuel from the tank and by pressurizing the fuel manifold between 60 and 125 PSI. The ECM is a powerful computer which controls all major engine functions. Sensors are electronic devices which monitor engine performance parameters. Engine performance parameters measure pressure, temperature and speed. This information is sent to the ECM via a signal voltage. Actuators are electronic devices which use electronic currents from the ECM to change engine performance. An example of an actuator is the Injector solenoid.Low Pressure Fuel System
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(5) Fuel pump (6) 2 Micron secondary fuel filter (7) Primary fuel filter and water separator (8) Fuel tank (9) Fuel pressure regulatorThe low pressure fuel system supplies fuel from the fuel tank to the injectors. The low pressure fuel system has three basic functions:
The low pressure fuel system supplies fuel to the injectors for combustion.
The low pressure fuel system supplies fuel to the injectors for cooling.
The low pressure fuel system supplies fuel to the fuel system in order to remove air.
The low pressure fuel system removes water from the fuel system. The major parts in a low pressure fuel system consist of the following components:
fuel tank
fuel transfer lines
primary fuel filter and water separator
fuel transfer pump
secondary fuel filter
fuel priming pump
fuel pressure regulator valveThe electronic unit injectors, the fuel transfer pump, the electronic control module, sensors, and actuators are part of the low pressure fuel system.In the low pressure fuel system, the fuel is pulled from the fuel tank through the primary fuel filter and the water separator.