If you're a car enthusiast, you know how important it is to have a well-functioning carburetor. One of the key components of a carburetor is the accelerator pump, which provides the necessary fuel to the engine when the throttle is opened. The Holley accelerator pump is a popular choice among car enthusiasts, and in this article, we'll discuss how to adjust it for optimal performance.
What is an accelerator pump?
The accelerator pump is a small diaphragm pump that is located in the carburetor. When the throttle is opened, the accelerator pump sends a small amount of fuel into the carburetor throat, helping to overcome the lag in fuel flow that occurs as the engine revs up.
Why adjust the accelerator pump?
Adjusting the accelerator pump can help improve engine performance and fuel efficiency. If the pump is not adjusted correctly, it could lead to a bog or stumble when the throttle is opened, or a rich condition that wastes fuel and causes emissions problems.
How to adjust the Holley accelerator pump
Adjusting the Holley accelerator pump is a straightforward process that can be done with a few basic tools. Here's how:
Step 1: Remove the air cleaner
To access the accelerator pump, you'll need to remove the air cleaner from the carburetor.
Step 2: Locate the accelerator pump adjustment screw
The accelerator pump adjustment screw is located on the side of the carburetor, near the throttle linkage. It may be covered by a plug that needs to be removed.
Step 3: Adjust the screw
Using a flathead screwdriver, turn the adjustment screw clockwise to decrease the amount of fuel delivered by the accelerator pump, or counterclockwise to increase it. The goal is to find the sweet spot where the engine responds smoothly and doesn't bog or stumble when the throttle is opened.
Step 4: Reinstall the air cleaner
Once you've found the optimal adjustment, reinstall the air cleaner and test drive the car to make sure everything is working correctly.
Conclusion
Adjusting the Holley accelerator pump is a quick and easy way to improve engine performance and fuel efficiency. By following these simple steps, you can ensure that your carburetor is delivering the right amount of fuel when you need it.