Fuel injection system

In a fuel injection system for mixture compressing, externally ignited internal combustion engines employing continuous fuel injection into the induction tube of the engine, the induction tube including in series and immediately adjacent, a converging region and a diverging region, the diverging region containing an axially slidable throttle element composed in part of two coaxial conical parts with adjoining bases and different apex angles, the slidable throttle element and the diverging region of the induction tube being positioned to form a minimum annular flow cross section and, downstream thereof, to form a shallow-angled diffuser, and wherein the fuel is injected into the minimum flow cross section, wherein that conical part of the throttle element which converges in the upstream direction has a larger apex angle than the other conical part and wherein the pressures acting on the throttle element are equalized, the improvement comprising:

• a. a fuel metering valve assembly means located in the fuel injection system for metering fuel in dependence on the size of said minimum flow cross section and in substantially linear dependence on air flow quantity, including
• a control slide which touches that conical part of said throttle element which converges in the direction of air flow and is slidable in its axial direction depending on the position of said throttle element.