Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

A pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine; the pump unit (1) comprising: a head (4) inside which a cylinder (12) extending along an axis (A1) is formed; a pumping piston (5) extending along the axis (A1) and slidingly coupled with the cylinder (12); a through-hole (13) which extends from the cylinder (12) towards the outside of the pump unit (1); an intake chamber (8) communicating with the cylinder (12) via the hole (13); an intake valve (7) which controls the flow of fuel from the intake chamber (8) to the hole (13); a cap (23; 123; 223) which is connected to the head (4), is arranged on the opposite side to the pumping piston (5) and can be selectively fixed along an outer surface (25) of the head (4) so as to close the intake chamber (8) on one side. 种泵单元，其用于将燃料、优选柴油供送至内燃机；所述泵单元(1)包括：头部(4)，沿着轴线(Al)延伸的缸体(12)形成在所述头部(4)内；泵送活塞(5)，其沿着所述轴线(A1)延伸并与缸体(12)滑动地耦接；通孔(13)，其从缸体(12)朝着泵单元(1)的外侧延伸；进给室(8)，其通过孔(13)与缸体(12)连通；进给阀(7)，其控制从进给室(8)到孔(13)的燃料流动；盖帽(23；123；223)，其连接至头部(4)，布置