Accelerator Pump Kit - 50cc (2300-4150 styles)

The Accelerator Pump Kit - 50cc (2300-4150 styles) from Quick Fuel Technology is a complete rebuild and replacement solution for Holley and Quick Fuel carburetors that rely on mechanical accelerator pump circuits. This kit addresses a critical component of the fuel delivery system—the accelerator pump—which is responsible for delivering a precise fuel charge during throttle opening to prevent stumbles and hesitation off-the-line. Whether you're diagnosing a carbureted performance engine that bogs or restoring a vintage carburetor to original function, this 50cc displacement pump kit ensures responsive, consistent acceleration across the RPM range.

The kit includes all necessary internal components—arm, cam, cover, diaphragm, hardware, and spring—allowing you to service the entire accelerator pump assembly without purchasing individual pieces. The 50cc displacement specification matches the factory design for 2300 and 4150 Holley-style carburetors, maintaining correct fuel volume and spray timing during transition from cruise to acceleration. The diaphragm, typically the first component to fail due to fuel degradation and age, is a new, pliable elastomer that restores proper pump actuation and eliminates fuel leaks around the pump body. Hardware and springs are corrosion-resistant and matched to original specifications, ensuring long-term reliability and ease of installation for carb rebuilders and street rodders alike.

This accelerator pump kit is essential for anyone rebuilding or freshening a 2300 or 4150 Holley carburetor, from stock restorations to high-performance street applications. Installation requires removal of the pump cover and diaphragm assembly; the modular design of this kit simplifies the swap and minimizes downtime. Mechanics and enthusiasts who prioritize throttle response and drivability will find this kit indispensable for eliminating the flat spots and hesitation that plague aged or worn accelerator pump systems. Compact and lightweight at 0.27 lbs, the complete assembly fits within standard Holley pump cavity dimensions and is compatible with both standard and high-rise carburetors in the 2300/4150 family.