Abstract: A plug-in connector for detachably connecting two lines has a first connector element, a second connector element, a carrier element to be fixed to the first connector element, and a latching element with at least one latching arm. The latching arm is disposed on the carrier element and when it is in a latching position, latches onto a matching latching element of the second connector element. The latching element is axially displaceable to assume a latching arm securing position and a latching arm release position relative to the carrier element. An operating element is provided on the carrier element for actuation in the latching arm release position to displace the latching arm into a separating position and which, when actuated in the latching arm securing position, retains the latching element in the latching arm securing position.

Abstract: A high-pressure fuel pump for an internal combustion engine with direct injection of fuel into at least one combustion chamber of the internal combustion engine is provided. The high-pressure fuel pump includes a low-pressure connection for low-pressure fuel, wherein the low-pressure connection supplies low-pressure fuel to the high-pressure fuel pump, a low-pressure fuel supply chamber, a pump element and a high-pressure connection for discharging fuel from the high-pressure fuel pump. The low-pressure connection, the low-pressure fuel supply chamber, the pump element, and the high-pressure connection are provided in succession in a flow direction of the fuel. A medium-pressure fuel connection opens into a medium-pressure fuel supply chamber for supplying medium-pressure fuel to the high-pressure fuel pump. A fuel switching valve selectively connects the low-pressure fuel supply chamber or the medium-pressure fuel supply chamber in a fluid-conducting manner to the pump element.

Abstract: A high-pressure fuel pump for an internal combustion engine with direct injection of fuel into at least one combustion chamber of the internal combustion engine is provided. The high-pressure fuel pump includes a low-pressure connection for low-pressure fuel, wherein the low-pressure connection supplies low-pressure fuel to the high-pressure fuel pump, a low-pressure fuel supply chamber, a pump element and a high-pressure connection for discharging fuel from the high-pressure fuel pump. The low-pressure connection, the low-pressure fuel supply chamber, the pump element, and the high-pressure connection are provided in succession in a flow direction of the fuel. A medium-pressure fuel connection opens into a medium-pressure fuel supply chamber for supplying medium-pressure fuel to the high-pressure fuel pump. A fuel switching valve selectively connects the low-pressure fuel supply chamber or the medium-pressure fuel supply chamber in a fluid-conducting manner to the pump element.

Abstract: A plug-in connector for detachably connecting two lines has a first connector element, a second connector element, a carrier element to be fixed to the first connector element, and a latching element with at least one latching arm. The latching arm is disposed on the carrier element and when it is in a latching position, latches onto a matching latching element of the second connector element. The latching element is axially displaceable to assume a latching arm securing position and a latching arm release position relative to the carrier element. An operating element is provided on the carrier element for actuation in the latching arm release position to displace the latching arm into a separating position and which, when actuated in the latching arm securing position, retains the latching element in the latching arm securing position.