Abstract: A carburetor for an internal combustion engine with an accelerator fuel pump in the carburetor having a piston actuated by a cam on a throttle valve shaft and a ball between them. The axis of a pump chamber in which the piston is slidably received is offset from and eccentric to the axis of rotation of the throttle shaft so that little fuel is supplied to the operating engine by the accelerator pump as the shaft is rotated to move the throttle valve from its idle position to an intermediate position and most of the fuel supplied by the accelerator pump to the engine is delivered as the shaft is rotated to move the throttle valve from the intermediate position to its wide open throttle position.

Abstract: A fuel injection advance angle control member (28) and a fuel control member (52) are manually and simultaneously controllable to increase the fuel injection angle and the volume of fuel injection, before an engine is started. A knob (112) is located in a position accessible for manipulation. A wire (110) connects the knob (112) to cams (102, 82) which are associated with the fuel injection advance angle control member (28) and the fuel control member (52), respectively. The connection between the knob (112) and the cam (102) includes a spring (210, 300) which is yieldable when the knob (112) is pulled, so that a reaction force counteracting the pulling effort is reduced to promote manipulation with a minimum of effort. Upon an engine start, the resilient force accumulated in the spring (210, 300) is released to move the member (28) to a desired advanced angle position through the cam (102).