FLANGE-HALF 2759376 - Caterpillar

Illustration 1 g01721176
(1) Primary speed/timing sensor
(2) Secondary speed/timing sensor
(3) Injectors
(4) Fuel pump
(5) 2 Micron secondary fuel filter
(6) Primary fuel filter and water separator
(7) Fuel tank
(8) Fuel pressure regulator
(9) Atmospheric pressure sensor
(10) Engine oil pressure sensor
(11) Engine coolant temperature sensor
(12) Inlet air temperature sensor
(13) Fuel temperature sensor
(14) Engine coolant level sensor
(15) Power Take Off (PTO) ON/OFF switch
(16) PTO SET/RESUME switch
(17) Timing calibration connector
(18) Throttle position sensor
(19) SAE J1939 Data Link
(20) Warning lamp
(21) Diagnostic lamp
(22) Programmable outputs
(23) Keyswitch
(24) Battery
(25) Electronic Control Module (ECM)
(26) Rail for the fuel supply The 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.There are five major components of the Electronic Unit Injector fuel system:
Electronic unit injectors
Fuel transfer pump
ECM
Sensors
SolenoidsThe 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 system 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. Solenoids are electronic devices which use electronic currents from the ECM to change engine performance. An example of an solenoid is the Injector solenoid.Low Pressure Fuel System
Illustration 2 g01721234
(4) Fuel pump
(5) 2 Micron secondary fuel filter
(6) Primary fuel filter and water separator
(7) Fuel tank
(8) Fuel pressure regulator The low pressure fuel system supplies fuel from the fuel tank to the injectors. The low pressure fuel system has four basic functions:
Supply fuel for combustion
Supply fuel in order to cool the injectors.
Remove air from the fuel.
Warm the fuel in the fuel tank.The major parts in a low pressure fuel system consist of the following components:
Fuel tank
Fuel transfer lines
Primary fuel filter or water separator
Fuel transfer pump
Secondary fuel filter
Fuel priming pump
Fuel pressure regulator valve
Fuel regulator valveThe electronic unit injectors, the fuel transfer pump, the ECM, sensors, and solenoids are part of the low pressure fuel system.In the low pressure fuel system, the fuel is pulled from the fuel tank to the primary fuel filter or to the water separator. The primary fuel filter removes large debris from the fuel before the fuel flows into the transfer pump. The fuel transfer pump is a gear pump that contains a pressure relief valve. Fuel flows from the outlet port of the transfer pump to the secondary fuel filter. All 1999 and newer engines use a 2 micron fuel filter. The 2 micron filter removes small abrasive contaminants from the fuel system, which can cause damage to the unit injectors.The fuel filter base contains