SKU: HLY20-109-10
UPC: 090127422908
MPN: 20-109-10
The 50cc Accelerator Pump Springs (10) from Holley are precision fuel system components designed for carburetor tuning and performance optimization. These springs are essential for anyone building or rebuilding a high-performance fuel delivery system, whether restoring a classic muscle car, tuning a street machine, or dialing in a race engine.
The accelerator pump is responsible for delivering a precise fuel charge when the throttle is opened, and the pump spring's tension directly controls the delivery rate and atomization pattern—making spring selection critical to throttle response and drivability. Holley's 50cc springs are manufactured to exacting tolerances to ensure consistent pump stroke volume and fuel delivery timing, maintaining their load characteristics across temperature extremes and repeated cycling.
Mechanics and engine builders working with Holley four-barrel carburetors—particularly models like the 4160, 4150, and double-pumper designs—will find these replacement springs indispensable during rebuilds or tuning. The pack quantity of 10 springs provides extra pieces for tuning experimentation, backup inventory, or use across multiple carburetors in a fleet application.
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