Tandem X Pump Adapter for Peterson R4

The Tandem X Pump Adapter for Peterson R4 by K.S.E. RACING is purpose-built for high-performance engine builders and circle track racers who demand precision fuel system integration. This adapter bridges the gap between dual-pump configurations and the Peterson R4 fuel system, allowing you to maximize flow capacity and redundancy in competition and extreme duty applications. Whether you're building a bracket racer, drag car, or circle track engine, this compact adapter eliminates guesswork and ensures reliable fuel delivery under sustained load.

Engineered by K.S.E. RACING—a brand trusted by professional mechanics and engine shops—the Tandem X adapter features precision machining to OEM tolerances, ensuring tight fitment and zero flow restrictions. The adapter's compact footprint (approximately 4.45 x 5.95 inches) allows seamless integration into tight engine bays without requiring extensive plumbing rework. At just 0.5 lbs, it adds negligible weight while maintaining the structural integrity needed to handle high-pressure fuel systems common in turbocharged and supercharged applications where dual pumps are essential for consistent delivery.

This adapter is ideal for serious competitors and engine builders who are upgrading from single-pump to tandem configurations, especially those already committed to Peterson fuel system components. Installation pairs directly with Peterson R4 assemblies, eliminating adapter stacking and potential pressure loss. Professional mechanics will appreciate the straightforward design that requires no modifications to existing fuel lines or tank fittings, making it a bolt-on upgrade that cuts installation time and reduces the risk of fuel system leaks.