255 LPH Retrofit Fuel Pump Assy. Return Style

The Holley 255 LPH Retrofit Fuel Pump Assembly in return style delivers high-volume fuel delivery for classic carbureted engine swaps and retrofit applications. Rated at 255 liters per hour, this electric in-tank pump provides the consistent flow rate required for reliable fuel system operation in street and performance builds. The aluminum construction with black anodized finish ensures durability and corrosion resistance in demanding under-hood environments.

This retrofit assembly features 1/4-inch NPT inlet and outlet connections, which are industry-standard fittings for flexible fuel line coupling on vintage and restomod fuel systems. The 255 LPH capacity accommodates carbureted engines requiring consistent fuel pressure across idle through peak RPM, eliminating fuel starvation during acceleration or prolonged highway driving. Return-style configuration allows excess fuel to flow back to the tank, regulating system pressure naturally and reducing heat buildup in long fuel lines.

Builders restoring muscle cars, hot rods, and vintage trucks commonly specify Holley fuel pumps for tank retrofit work when original mechanical pumps no longer meet performance demands. The universal fitment allows integration into custom fuel system designs where OEM in-tank pump assemblies are unavailable or incompatible. This pump runs on gasoline and suits applications ranging from mild street engines to higher-displacement carbureted powerplants requiring stable fuel delivery.

The return-style design is essential for carbureted systems that depend on fuel pressure regulation through a mechanical regulator mounted on the engine or fuel line. Unlike demand-style pumps used in fuel-injected vehicles, return pumps cycle continuously, maintaining consistent tank pressure while returning excess volume. For builders choosing between pump styles, the return configuration remains the standard choice for traditional carburetor fuel systems and retrofit installations.