Fuel Regualtor EFI to Carb - Bypass Style

The Aeromotive Fuel Regulator EFI to Carb – Bypass Style (MPN 13220) bridges the gap between modern fuel-injected systems and traditional carbureted engines, making it an essential component for enthusiasts converting late-model powerplants into classic platforms or adapting EFI fuel systems to carb-fed applications. This in-line regulator is engineered for builders who need reliable pressure control without complex external return lines, offering a compact solution that maintains fuel system integrity across gasoline, diesel, and E85 fuel types. Whether you're adapting a crate engine swap, experimenting with alternative fuel systems, or fine-tuning a carb setup that demands precise pressure stability, this bypass-style design delivers the pressure management required for consistent engine performance.

Built with black anodized aluminum construction, the regulator features a 3/8-inch NPT inlet connection and dual 3/8-inch NPT outlets with a dedicated 3/8-inch NPT return port, allowing flexible plumbing configurations in tight engine bays or custom fuel system layouts. The bypass style operation maintains a constant supply pressure between 5 and 10 psi—the sweet spot for carbureted and low-pressure fuel systems—by routing excess fuel back through the return line rather than relying on complex bypass valves. Aeromotive's engineering ensures stable pressure regulation across varying engine loads and throttle conditions, critical for preventing vapor lock, fuel starvation, or flooding that can compromise engine start-ability and drivability in modified applications.

Mechanics and engine builders consistently choose this regulator for EFI-to-carb conversions, street rod restorations, and alternative-fuel experiments where OEM fuel system architecture doesn't fit the final build. Its compact footprint (5.6 x 2.5 x 5.7 inches) and light weight (1.3 lbs) make it ideal for engine bay installations where space is contested, while the multi-fuel compatibility eliminates the need for separate components when transitioning between gasoline, E85, or diesel blends. Installation is straightforward for anyone experienced with in-line fuel system plumbing; ensure adequate return line diameter and verify regulator mounting orientation to maintain gravity-assisted fuel return flow.