A throttle body assembly for a combustion engine includes a throttle body having a pressure chamber including a supply of liquid fuel, and a throttle bore with an inlet through which air is received. A throttle valve is carried by the throttle body with a valve head movable relative to the throttle bore. A metering valve is coupled to the throttle body, and has a valve element that is movable between open and closed positions. A boost venturi is located in the throttle bore and has an inner passage that is open at both ends to the throttle bore. The boost venturi has an opening through which fuel flows into the inner passage when the valve element is in the open position, wherein fuel flows from the pressure chamber to the metering valve under the force of gravity or under a pressure of less than 6 psi.

A fuel pump includes a fuel pump housing with a pumping chamber and an inlet valve bore which extends along an inlet valve bore axis. The inlet valve bore is stepped such that the inlet valve bore includes a shoulder which is traverse to the inlet valve bore axis. A pumping plunger reciprocates within a plunger bore along a plunger bore axis such that an intake stroke of the pumping plunger increases volume of the pumping chamber and a compression stroke of the pumping plunger decreases volume of the pumping chamber. An inlet valve assembly includes a valve seat with a valve seat flow passage extending therethrough, the valve seat abuts the shoulder and is urged toward the shoulder by pressure within the pumping chamber during the compression stroke. The inlet valve assembly also includes a valve member which is moveable between an unseated position and a seated position.

An electronic fuel injection throttle body unit has a core body with two side components. The two side components each including a fuel delivery passage. Four air intake passages extending vertically through the throttle body. Valves are rotatable within the air intake passages. The valves being connected to valve shafts that rotate about respective valve shaft axes. The valve shaft axes and the fuel delivery passages are perpendicular to each other.

A throttle body assembly for a combustion engine includes a throttle body having a pressure chamber including a supply of liquid fuel, and a throttle bore with an inlet through which air is received. A throttle valve is carried by the throttle body with a valve head movable relative to the throttle bore. A metering valve is coupled to the throttle body, and has a valve element that is movable between open and closed positions. A boost venturi is located in the throttle bore and has an inner passage that is open at both ends to the throttle bore. The boost venturi has an opening through which fuel flows into the inner passage when the valve element is in the open position, wherein fuel flows from the pressure chamber to the metering valve under the force of gravity or under a pressure of less than 6 psi.

Device for controlling an injector, including a passage space which can be closed off on one of its two sides by an armature element in order to thereby optionally separate a fluid high-pressure region from a fluid low-pressure region of the injector, a control space for applying a variable pressure to an injector component, preferably an injector needle, a valve which is arranged between another of the two sides of the passage space and the control space, a first connection which connects the high-pressure region of the injector to the passage space, and a second connection which connects the passage space to the control space, wherein the valve is configured to establish a direct connection between the high-pressure region and the control space if the pressure level in the passage space is equal to or higher than a predetermined value.

An injector has an injector body including an injector cavity defining an inner wall and a longitudinal axis, an injector orifice and a plunger slidably disposed within the injector cavity. The plunger has an outer portion and an inner portion at different locations longitudinally along the plunger. The inner portion has a plurality of surface portions including a guiding portion configured to substantially mate with the inner wall of the injector cavity, guide the plunger to slidably move in a direction along the longitudinal axis and substantially prevent the plunger from laterally translating within the injector cavity. The plurality of surface portions also includes a restriction portion configured to form a restrictive cavity between an exterior surface of the inner portion and the inner wall of the injector cavity axially along a length of the inner portion.

A gas injector for injecting a gaseous fuel, in particular directly into a combustion chamber of an internal combustion engine, including: a valve closing element for opening or closing a pass-through opening, a valve body, and a sealing seat between the valve body and the valve closing element, in the case of a maximum lift of the valve closing element a flow cross section between the valve body and the valve closing element being smaller in the flow direction upstream from the sealing seat than a flow cross section between the valve closing element and the sealing seat and being smaller than a flow cross section in the flow direction downstream from the sealing seat.

A fuel injector includes a housing defining a longitudinal bore having a proximal end and a distal end, a high pressure fuel duct in communication with the longitudinal bore and a valve seat including a valve seat surface and an aperture at the distal end of the longitudinal bore. A poppet valve is disposed in the longitudinal bore and includes a valve head that is engageable with the valve seat surface. An actuator device is disposed at the proximal end of the longitudinal bore and a hydraulic coupler is disposed between the actuator and the poppet valve within the longitudinal bore. The hydraulic coupler defines a chamber that receives low pressure fuel for providing a hydraulic lash adjuster between the actuator and the poppet valve.

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a high-pressure pump having a pump element, a regulating device positioned upstream of the high-pressure pump, a fuel channel defined between an inflow side of the regulating device and the pump element, and a safety device, actuatable to reduce a through-flowable cross section of the fuel channel.

The pump delivered pressure is regulated to a substantially constant set value, and output flow is varied by an inlet metering valve (5) via feedback from the motion of, or flow from the spilled fuel through, a delivered pressure regulator (13, 19). The pressure regulating element can be biased to close a seal surface (12′) against flow from the outlet side of the pump (14) toward the inlet metering valve when the pump is turned off, thereby holding sufficient rail pressure to prevent boiling during hot soak conditions. In another aspect, a flow stabilization orifice (18) is provided between the outlet of the pump and the inlet metering valve, e.g., upstream of the pressure regulating element. In yet a further aspect, the inlet metering valve is hydraulically responsive (6, S, L) to changes in flow resulting from movement of the pressure responsive element (13).