What does an accelerator pump diaphragm do?

The accelerator pump diaphragm is a key component in a carburetor. When you press the gas pedal, it squirts a small amount of fuel into the intake manifold, preventing hesitation or a stumble as the engine's demand for fuel increases.

What carburetors does this diaphragm fit?

This Edelbrock accelerator pump diaphragm is designed for 4150-style carburetors, commonly found on Holley, Demon, and Quick Fuel models. It's important to verify your carburetor model before purchasing.

Does this diaphragm come with any hardware?

This product is a set of 8 accelerator pump diaphragms. It does not include any additional hardware; you will reuse the existing hardware from your carburetor during installation.

Edelbrock Accelerator Pump Diaphragm 30cc

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Edelbrock

Specifications

Brand: Edelbrock
Part #: 12400
UPC: 85347124008

Edelbrock

Edelbrock Accelerator Pump Diaphragm 30cc

Name: Edelbrock Accelerator Pump Diaphragm 30cc
Brand: Edelbrock
Price: 13.95 USD
Availability: InStock

$13.95

Edelbrock Accelerator Pump Diaphragm 30cc for Holley/Demon/Quick Fuel carburetors. Helps restore proper fuel delivery.

Key Features

Fits 113+ vehicle make/model combinations.
Edelbrock Accelerator Pump Diaphragm for Holley, Demon, and Quick Fuel carburetors.
30cc gasoline capacity.
Designed for 4150-style carburetors.
Helps restore proper accelerator pump function for improved throttle response.
Set includes 8 diaphragms.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

This is the Edelbrock Accelerator Pump Diaphragm, a 30cc gasoline diaphragm designed to help restore proper fuel delivery in Holley, Demon, and Quick Fuel carburetors. If your vehicle is experiencing hesitation or a stumble when you hit the gas pedal, a worn-out accelerator pump diaphragm could be the culprit. This part is crucial for ensuring your engine gets that immediate squirt of fuel it needs when you demand more power.

This diaphragm is a well-built replacement part that fits a wide range of vehicles, including many Chevrolet C/K series trucks, Camaro, Caprice models, and Chrysler Cordoba and LeBaron cars from the early 80s. It's designed to work with 4150-style carburetors, providing a direct replacement for your old, cracked, or leaking diaphragm. Proper installation is key to its function and longevity, so be sure to follow the manufacturer's guidelines.