Electric fuel pump (only for petrol engines)

In vehicles with petrol engines, the electric fuel pump is installed in the fuel tank. The pump is two-stage and at the same time is a fuel reservoir with a volume of approximately 600 cc.

The pump housing is suspended on a bracket with elastic shock absorbers, which significantly reduce noise transmission.

To illustrate, let's imagine the operation of a pump here. It contains two independent pumps driven by a single electric motor. The first stage of the pump sucks fuel through a coarse filter and drives it through a riser tube into the pump housing - into the tank. The second stage sucks fuel from the reservoir and delivers it through a pipeline to the engine injection device.

This pump develops a pressure of 0.3 MPa and a capacity of approximately 90 l/h. The pump sucks fuel through the suction channel and throws it into the exhaust pipeline. All parts of the pump are immersed in fuel.

The non-return valve, located in the outlet fitting, prevents the return flow of fuel from the pressure pipeline through the pump into the tank and simultaneously maintains the operating pressure for a certain time after the ignition is turned off. Unclaimed fuel in the injection device is returned through the drain pipe back to the tank.