Pic. 2.62. Fuel pump: 1 - block of the fuel pump; 2 - fuel gauge sensor
Due to the fact that the vehicle uses a system without fuel return to the tank, the fuel pump unit, with the exception of the fuel gauge sensor, is integrated. In order to prevent the reduction of engine power due to insufficient fuel supply, for example, when the vehicle is turning, the fuel pump has been designed so that the fuel supply is constant. The fuel remaining in the fuel pump reservoir is supplied from two sources: a check valve and an ejector (pic. 2.62, 2.63).
Pic. 2.63. Fuel pump operation diagram: 1 - block of the fuel pump; 2 - fuel gauge sensor; 3 - fuel pump; 4 - fuel filter (high pressure); 5 - fuel filter (low pressure); 6 - reservoir of the fuel pump; 7 - pressure regulator; 8 - jet fuel pump; 9 - valve-distributor; 10 – main fuel flow; 11 - return flow of fuel; 12 - to the fuel distributor; 13 - fuel tank