In-tank Fuel Pump Modual 255LPH Retro-Fit

The Holley In-tank Fuel Pump Module 255LPH Retro-Fit is engineered for builders and enthusiasts upgrading fuel delivery on carbureted or EFI platforms that demand reliable high-flow performance. This drop-in retrofit module addresses the core challenge facing engine modifiers: factory fuel systems typically max out around 40–60 LPH, creating a bottleneck when stepping up displacement, adding turbocharging, or installing direct-injection upgrades. The 255 LPH capacity provides the margin needed for naturally aspirated builds up to approximately 400–450 horsepower and serves as a solid foundation for forced-induction applications requiring headroom above baseline demand.

Built by Holley—a trusted name in fuel systems for over 100 years—this module features a brushless electric pump housed in a black anodized aluminum assembly that resists corrosion and maintains structural integrity under sustained pressure cycling. The pump integrates 1/4 inch NPT female inlet, outlet, and return ports, enabling straightforward integration into existing fuel system plumbing without requiring custom adapters or extensive fabrication. Compatibility with both gasoline and E85 ethanol blends makes this module versatile across different fuel strategies, while the in-tank design minimizes external noise and heat transfer, preserving fuel temperature stability during extended high-RPM runs.

Mechanics and engine builders typically specify the 255 LPH module for bracket-racing builds, street performance restorations, and engine swaps where OEM fuel system capacity falls short of modified engine demand. Installation requires tank access and basic understanding of fuel system plumbing, making it suitable for both professional shops and experienced DIY builders. Whether you're retrofitting a classic muscle car, upgrading a modern platform, or supporting a turbocharged conversion, this Holley pump delivers the flow consistency and pressure reliability needed to prevent fuel starvation and ensure repeatable power delivery across the RPM band.