Where does excess fuel go in a Caterpillar engine?
The excess fuel flow that pumped through the system exits the cylinder head near the rear of the engine. he fuel exits the fuel gallery and returns to the fuel filter base. A pressure regulating valve (7) that is located in the fuel filter base regulates the pressure for the fuel system.
How does the fuel transfer pump work in a caterpillar?
In the case of extreme pressure, fuel is redirected back to the inlet of the fuel transfer pump. There are internal check valves that are also incorporated into the fuel transfer pump. An inlet check valve prevents fuel from draining back to the fuel tank while the fuel transfer pump is not in operation.
How does the ECM control fuel injection timing?
By controlling the timing and the duration of the voltage signal, the ECM can control injection timing and the amount of fuel that is injected. The ECM sets certain limits on the amount of fuel that can be injected. “FRC” is a limit which controls the amount of air and of fuel for emission control.
How does the ECM work in a Caterpillar engine?
An Electronic Control Module (ECM) sends a signal to each injector solenoid in order to provide complete control of the engine. The ECM controls the amount of fuel that is injected by varying the signals that are sent to the injectors. The ECM sends a high voltage signal to the solenoid in order to energize the solenoid.
How is air kept out of the fuel system?
The diesel fuel system is designed to keep air out of the fuel system by keeping the entire system full of diesel at all times. Air can get into the fuel system after a fuel filter change or if the vehicle runs out of diesel.
When to purge air from a fuel filter on a diesel?
Air can get into the fuel system after a fuel filter change or if the vehicle runs out of diesel. If there is air in the fuel system, do not continue to crank the engine until the system is full of diesel again. Park the vehicle in a safe and well-ventilated work area.