Patent ID: 6129518
Filing Date: 2000-10-10
Classification: F02M

Abstract:
A pumping device for feeding fuel from a tank to an internal combustion engine, and comprising a low-pressure pump; a high pressure pump in turn comprising a body forming an inner chamber, and at least one piston activated by a control element housed in said inner chamber and an on-off valve housed in a connection between said low-pressure pump and said high-pressure pump; said on-off valve comprising a member activated by the fuel from said low-pressure pump to open an intake channel in said connection and feed surplus fuel to said inner chamber; characterized in that said low-pressure pump is activated mechanically by means connected to the shaft of said engine; said member having a choke having a diameter sufficiently small to be activated at the cranking speed of said engine, wherein said on-off valve comprises an opening communicating with said inner chamber; characterized in that, when activated, said member also provides for opening an additional opening communicating with said inner chamber.