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In this paper, two concepts of fuel pumping methods using solenoid, for gasoline injection in engines, are discussed. The fuel pump is integrated within the injector in these concepts, which makes the fueling system, simple, compact and less expensive. This integrated gasoline pump injector (GPI) is aimed at catering to the upcoming stringent emission norms, as it enables the usage of closed-loop fuel correction with the help of an electronic control unit (ECU), based on the exhaust lambda feedback. A solenoid and spring arrangement is used in this injector design, where the fuel gets pressurized in a pumping chamber, and the pressurized fuel is then injected through orifices to produce spray in the intake port. Two concepts are used for pressurizing the fuel. First concept uses a spring to pump the fuel and a solenoid to retract the plunger. Second concept uses solenoid to pump the fuel and spring to retract the plunger.

Asian countries hold a vast majority of the global two-wheeler population. Currently majority of these two wheelers are fueled by carburetors owing to their low cost and ease of maintenance. As these countries try to adopt emission norms similar to that of Euro 6 in a few years from now, they will be migrating to an injection system like port fuel injection (PFI), as it offers good control over emissions by using closed loop corrections, based on the exhaust lambda feedback. Stanadyne R&D has developed an innovative injection system that can be applied for such port fuel injection in two-wheelers. In this innovative design, the pump and injector are integrated into a single unit, making the system simple, compact and less expensive. The integrated injector uses a solenoid and spring arrangement, for pressurizing the fuel in a small chamber, and consumes less current. The pressurized fuel is then injected through orifice to produce spray in the intake port.