Abstract: Transfer pump for high-pressure petrol injection of the type including a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of the bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby the fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein elements are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of the piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: Transfer pump for high-pressure petrol injection of the type comprising a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of said bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby said fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein means are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of said piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: The invention relates to a device for supplying fuel under high pressure in which the fuel is put under high pressure by a transfer pump, characterized by the fact that it comprises two identical transfer pumps (3, 4), powered by a control means, controlling the fuel feed rate of the two pumps, the latter supplying the same common rail (2).