30cc Pump Diamphragm (10pk)

The 30cc pump diaphragm 10-pack from Advanced Engine Design is the go-to replacement component for carburetor enthusiasts maintaining Holley four-barrel carburetors. These rubber diaphragms are essential wear items that regulate fuel delivery to the accelerator pump circuit—the mechanism responsible for enriching the fuel mixture during throttle tip-in. Whether you're rebuilding a classic muscle car, restoring a street rod, or maintaining a high-performance engine, having a bulk supply of quality diaphragms on hand eliminates downtime and keeps your fuel system responsive.

Each 30cc diaphragm functions by flexing in response to manifold vacuum and mechanical linkage, precisely metering fuel into the main discharge nozzle during acceleration. The rubber composition resists ethanol and fuel degradation over extended storage, while the 30cc displacement rating matches the stock flow requirements of most Holley carburetors across street and strip applications. This 10-pack format provides the economy that serious mechanics demand, offering enough spares for multiple carburetors or years of preventive maintenance without frequent reordering.

Carburetor builders, engine shops, and dedicated car owners benefit most from stocking this diaphragm set, particularly those running vacuum-dependent Holley designs common on 350 Chevrolets, 455 Oldsmobiles, and comparable displacement engines. Installation requires only carburetor removal and pump housing disassembly—a 15-minute job for anyone comfortable with hand tools. Direct replacement with zero modifications ensures your accelerator pump circuit restores factory response characteristics, eliminating hesitation and flat spots caused by aged or deteriorated original diaphragms.