What Is a Double Pumper

The Double Pumper gets its name from the twin accelerator pump outlets (arrows) for both the primary and secondary throttle bores. This is an HP version carburetor where the choke housing is removed for smoother air inlet into the carburetor. … The manual choke can easily be upgraded to electric control at a later date.

Do I need a double pumper carburetor?

Certainly if the engine has high compression, a serious cam, a single-plane intake, 3.70:1-or-steeper gears, and a manual trans or an automatic with a high-stall converter, you should definitely run a double-pumper. Ditto if you have a very lightweight (under-3,100 pounds) car regardless of the overall combo.

Is a Holley 4150 a double pumper?

Holley 4150 Overview The 4150 carburetor was first introduced for the 1957-58 Ford Thunderbird. … Often referred to simply as the “double pumper,” the 4150 and 4150-style carburetors fuel-feed inlets and a second full metering block on the secondary side, giving it dual accelerator pumps.