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Old 12-21-2003, 03:18 AM
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double pumper carb

i dont know much about carbs, so what is double pumper? how it works etc, is it good for street or strip?

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Old 12-21-2003, 08:09 AM
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This is a Holley carb term for carbs that have two accelerator pumps, front and back. Not to be confused with dual fuel inlets. This is a strip carb. I've found a vacuum secondary carb is more forgiving and better for street use.
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Old 12-21-2003, 10:59 AM
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Agree with the above post, unless you have a pro street car a double pumper Holley on the street is not the best package.

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Old 12-22-2003, 03:09 PM's Avatar Moderator
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They have double accelerator pumps because they have a mechanical linkage that opens the secondaries on the carb with movement of the throttle linkage, regardless of the engine demand. The secondary accelerator pump helps overcome the huge bog that would result from opening more throttle that the engine needs. As stated above, they were designed for drag racing engines that operate at max RPM all the time. They can be used on the street but a well sized vacuum secondary carb will beat them in acceleration, mileage, driveability, and every other way imaginable on a street/strip car.
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Old 12-22-2003, 03:13 PM
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Plus, they are generally one big pain in the a**.

Stick with the vacuum secondaries if using a Holley.
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