Fuel pump is a buzzword for the auto parts industry. It is one of the basic components of the fuel injection system of the EFI vehicle. It is located inside the fuel tank of the vehicle. The fuel pump works during startup and engine operation. If the engine is stopped and the ignition switch is still ON, the HFM-SFI control module turns off the power of the fuel pump. To avoid accidental ignition.
The function of the fuel pump is to suck the fuel from the fuel tank, pressurize it, and then deliver it to the fuel supply pipe, and cooperate with the fuel pressure regulator to establish a certain fuel pressure.
Electric centrifugal booster pump In some aircraft, the electric centrifugal booster pump is used as an auxiliary fuel pump for the fuel system. The motor is usually mounted on a spar corresponding to the lower position of the fuel tank, while the pump body is immersed in fuel at the bottom of the fuel tank. Take sealing measures between the pump impeller and the motor to prevent fuel or oil vapor from leaking into the motor. When the fuel enters the pump body, the high-speed rotating impeller throws the fuel outward in the radial direction, generating centrifugal force, increasing the fuel pressure and delivering the fuel to the system. The rotary agitation of the pump also has the effect of separating air and oil vapor from the fuel, so that the fuel supplied to the engine is free of oil vapor.
Plunger electric fuel pump Due to the higher cost of electric centrifugal booster pumps, the fuel systems of many small lower single-wing aircraft use electric plunger pumps as auxiliary fuel pumps for the fuel system. Plunger pumps are usually installed in parallel with engine-driven diaphragm fuel pumps, so that they supply fuel to the engine individually or together. The plunger type fuel pump is a pulsation pump. It consists of a solenoid, a plunger, a calibration spring, and two one-way valves. The electromagnetic coil is wound on a brass tube connected to two oil chambers. The spring force of the calibration spring pushes the plunger up, and the coil electromagnetic force pushes the plunger down. One one-way valve is installed in the middle of the plunger part, and the other is installed in the middle of the bottom of the brass pipe extension in the oil inlet cavity.
Vane fuel pump