Secondary Float Bowl - Double Pump

The Advanced Engine Design Secondary Float Bowl – Double Pump (model 5365S) is a center-hung carburetor fuel bowl designed specifically for Holley 4150-series carburetors. This aluminum component features a tumble-polished finish and includes a sight window for real-time fuel level monitoring during engine operation. Built as a secondary fuel bowl, it handles the fuel delivery requirements during high-demand acceleration and wide-open throttle conditions.

The aluminum construction provides a balance between durability and weight savings—critical for performance fuel systems where every fraction of weight matters. The tumble-polished finish not only improves appearance but also aids in corrosion resistance within the fuel chamber. The center-hung mounting configuration is standard for Holley 4150 applications, ensuring proper fuel pressure distribution to both primary and secondary circuits. The integrated sight window allows tuners and mechanics to verify fuel level and identify any fuel vaporization issues during dyno testing or track operation, eliminating guesswork during carburetor setup.

This bowl is essential for builders restoring or upgrading classic carbureted engines, street rods, and competition vehicles running Holley 4150 carburetors. Whether replacing a worn original bowl or upgrading to a higher-capacity secondary circuit, this component ensures consistent fuel delivery under sustained high-load conditions. The double-pump design supports both atmospheric and fuel-injected engine conversions where Holley 4150 carburetors are preferred for throttle response and tuning accessibility.