Carburetor accelerator pump (VAZ-2109)

The accelerator pump enriches the combustible mixture when the throttle valve is opened sharply, ensuring good throttle response of the car. The accelerator pump is a diaphragm type, with a mechanical drive from cam 6 (figure 49) on the axis of the first chamber throttle valve.



When the throttle valve 7 is opened sharply, the cam 6 presses the lever 5 and through the spring in the pusher 4 acts on the diaphragm 3, overcoming the resistance of the return spring. The diaphragm supplies fuel through the ball valve 2 for supplying fuel and injects it through the sprayer 1 into the first and second mixing chambers, enriching the combustible mixture. During the return stroke of the diaphragm, under the action of the return spring, fuel is sucked from the float chamber through the check ball valve 8 into the working cavity of the accelerator pump. The amount of fuel injected by the accelerator pump is not regulated and depends only on the cam profile.