By BMW «520i» an electric fuel pump is used, installed at the rear of the car next to the fuel tank.
Removing both the mechanical and electric fuel pumps is not difficult.
Fuel pump for BMW engines «518», «520»:
1 - pusher; 2 - heat-insulating gasket; 6 - pump housing.
Fuel pump parts for BMW engines «525» And «528»:
6 - pusher; 10 - pump housing; 18 - diaphragm; 20 - pump cover.