The ECM determines the quantity, timing, and pressure of the fuel in order to be injected into the fuel injector. #Electronic control for the fuel system (typical example) The quantity of the fuel that is required by the ECM is set to zero. The engine electronic control module (ECM) specifies the amount of fuel. The engine shuts off by interrupting the fuel supply. The fuel transfer pump has a fuel bypass valve in order to allow the low-pressure fuel system to be primed. The fuel transfer pump circulates fuel through the primary fuel filter and the secondary fuel filter. The fuel transfer pump has a regulating valve in order to control the low pressure. The fuel transfer pump provides a relatively low fuel pressure to the fuel injection pump. The fuel transfer pump is a serviceable component.
The fuel output of the fuel injection pump is controlled by the ECM in response to changes in fuel pressure. The fuel injection pump has the following operation: A feature of the fuel injection pump allows fuel to return to the tank continuously. The solenoid allows excess fuel to be diverted away from the fuel manifold and back to the tank. The solenoid for the fuel injection pump is controlled by the ECM in order to maintain the fuel manifold pressure at the correct level. The injector will use only part of the fuel that is delivered by each stroke of the pistons in the pump. The fuel injection pump delivers a volume of fuel six times for each revolution. There is a cam for each piston and each cam has three lobes. The fuel injection pump has two pistons that are driven by a camshaft. The pump assembly is driven from a gear in the front timing case at half engine speed. The fuel pump assembly consists of a low-pressure transfer pump and a high-pressure fuel injection pump.
The fuel transfer pump is located in the fuel injection pump. Air is removed from the fuel system to the fuel return line to the tank. The pump has a plunger (1) which is manually operated in order to prime the fuel system. The primary filter/water separator is located between the fuel tank and the priming pump. The fuel injection system has the following mechanical components: A pipe is connected to the rear of the cylinder head in order to return the leakoff fuel to the pressure side of the fuel transfer pump. The leakoff fuel from each injector passes into a drilling which runs along the inside of the cylinder head. The ECM determines the correct time for activation of the correct electronic unit injector (1) which allows fuel to be injected into the cylinder. The high-pressure fuel is continuously available at each injector. The ECM controls a solenoid (6) in the fuel injection pump (7) in order to maintain the actual pressure in the high-pressure fuel manifold (2) at the desired level. A pressure sensor (3) in the high-pressure fuel manifold (2) monitors the fuel pressure in the high-pressure fuel manifold (2). The fuel is at a pressure of 70 MPa (10152.7 psi) to 130 MPa (18855 psi). The fuel injection pump (7) feeds fuel to the high-pressure fuel manifold (2). High-pressure fuel system (typical example) The leak off fuel from the electronic unit injectors returns from a connection in the cylinder head to the pressure side of the transfer pump. There is a small orifice in the fuel filter base in order to purge any air back to the tank. The fuel is pumped at an increased pressure to the Fuel manifold (rail).Įxcess fuel from the Fuel manifold (rail) returns to the tank through a non-return valve. Fuel passes from the Fuel filter to the Fuel injection pump (7).
The fuel filter removes particulates from 18 microns to 4 microns in size in order to prevent contamination of the high-pressure components in the fuel system. The fuel passes from the ECM to a 4 micron fuel filter (6). The fuel is pumped through the optional fuel cooler (4) to the ECM (5). The transfer pump increases the fuel pressure to 400 kPa (58 psi) to 500 kPa (72.52 psi). (D) Return from the Electronic Unit Injectorsįuel is drawn from the fuel tank (E) through a 18 micron Primary fuel filter (1) and the Water separator (2) to the Transfer pump (3). (B) Return from the Pressure Relief Valve (PRV) on the high-pressure fuel manifold (A) Outlet for high-pressure fuel to the high-pressure fuel manifold Low-pressure fuel system (typical example)
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