General Explanation:
The accelerator pump is a component found in cars that have carburetors. When you press down on the gas pedal to accelerate, the accelerator pump delivers a burst of extra fuel to the engine. This extra fuel helps the engine produce more power and respond quickly to your input. Without the accelerator pump, the engine may hesitate or stall when you try to accelerate quickly.
Technical Explanation:
Common Symptoms:
- Hesitation or stumbling when accelerating
- Engine stalling when accelerating
- Poor throttle response
- Engine backfiring
- Black smoke coming from the exhaust
Diagnosing: To diagnose an issue with the accelerator pump, a mechanic may perform the following checks:
- Inspect the accelerator pump diaphragm for any tears or damage
- Check the accelerator pump linkage for proper adjustment
- Test the accelerator pump circuit for proper fuel delivery
- Check for any clogs or blockages in the accelerator pump circuit
Common Repairs:
- Replacing the accelerator pump diaphragm
- Adjusting the accelerator pump linkage
- Cleaning or replacing the accelerator pump circuit
- Rebuilding or replacing the carburetor
It is important to address any issues with the accelerator pump promptly to ensure smooth and efficient operation of the engine.