30cc Pump Diaphram (2pk)

The 30cc pump diaphragm (2pk) from DEMON CARBURETION is a critical fuel delivery component designed for carburetor systems that rely on mechanical pump action to supply consistent fuel pressure to the engine. Whether you're rebuilding a classic muscle car, restoring a vintage street machine, or maintaining a high-performance carbureted engine, this diaphragm pack addresses one of the most common wear points in mechanical fuel pumps. As fuel demand increases during acceleration and heavy throttle application, the diaphragm flexes thousands of times per minute, making it prone to deterioration over time.

Each 30cc diaphragm functions as the flexible membrane that separates the fuel chamber from the mechanical actuator, allowing the pump to draw fuel from the tank and push it toward the carburetor bowl under load. Over extended use, ethanol in modern gasoline breaks down rubber compounds, causing the diaphragm to crack, harden, or lose its seal integrity—resulting in fuel starvation, inconsistent idle quality, or a lean running condition. DEMON CARBURETION engineered this two-pack solution to provide a complete replacement set, ensuring you have a backup diaphragm on hand and eliminating downtime between rebuild cycles. The compact 2.95 x 1.1 x 4.05-inch profile and minimal 0.07 lbs weight make installation straightforward for any mechanic working on in-tank or external mechanical pump assemblies.

Enthusiasts running carbureted engines—whether naturally aspirated street rods, vintage race platforms, or supercharged applications—will find this diaphragm pack indispensable for annual maintenance intervals or emergency pump failures. The 30cc capacity rating indicates this diaphragm is engineered for pumps designed to displace 30 cubic centimeters per cycle, making it compatible with DEMON CARBURETION fuel pump models and similar aftermarket mechanical pump assemblies rated in this displacement range. Installation requires only basic hand tools and takes minutes per diaphragm, making it an ideal DIY upgrade when tuning carbureted engines or addressing fuel delivery issues that affect throttle response and drivability.