Understanding Single Diaphragm Accelerator Pump in Carburetor

Explanation: The single diaphragm accelerator pump in a carburetor discharges fuel when the throttle is opened quickly to provide an instant fuel boost to prevent hesitation or stumbling during acceleration. When the throttle is opened, the vacuum created by the engine draws fuel from the float bowl into the pump well, causing the diaphragm to move downward. As the diaphragm moves down, it pressurizes the fuel and forces it out through the discharge nozzle into the main metering circuit of the carburetor.

Function of Single Diaphragm Accelerator Pump

The single diaphragm accelerator pump plays a crucial role in ensuring smooth acceleration in an engine. When the driver presses the gas pedal quickly to accelerate, the accelerator pump discharges fuel into the engine to provide an immediate boost in fuel supply, preventing any delay or hesitation in throttle response.

Operation of Accelerator Pump

As mentioned earlier, when the throttle is opened rapidly, the vacuum created by the engine draws fuel from the float bowl into the accelerator pump well. This action causes the diaphragm to move downward, pressurizing the fuel in the pump well. The pressurized fuel is then forced out through the discharge nozzle into the main metering circuit of the carburetor, where it mixes with air before entering the engine cylinders for combustion.

Benefits of Accelerator Pump

The presence of a single diaphragm accelerator pump ensures that the engine receives an immediate fuel boost during acceleration, preventing any hesitation or stumbling that may occur in the absence of this component. This allows for smooth and responsive acceleration, contributing to an overall better driving experience.