1981-1988 Oldsmobile Cutlass G-Body LS EFI Fuel Tank Kit with 255 LPH Pump
If you are planning an LS swap in a 1981 through 1988 Oldsmobile Cutlass G Body and need a fuel delivery solution matched to rigorous power demands, the 1981-1988 Olds Cutlass EFI Fuel Tank Kit - 255 LPH Pump offers precise performance for engines up to 550 hp. Designed for straightforward installation with no cutting or welding, this kit aligns with factory flange and strap locations for a direct fit assembly. The in module 255 LPH Walbro pump sits in a corrosion resistant steel tank with an integrated sending unit. Every kit component from tank straps and filler neck to vent filter, gaskets and hardware is provided so installers can complete the job confidently.
Design and Compatibility
The 1981 through 1988 Olds Cutlass EFI Fuel Tank Kit for LS conversions is engineered for G Body chassis applications and integrates directly with MuscleRods mounting components to establish precise alignment of the engine and transmission centerlines. By matching the stock tank cavity profile, this package eliminates the need for chassis modifications while preserving suspension geometry. Each fitting and flange corresponds to original locations, ensuring the fuel path, venting and fill connections follow factory routing without binding or tension on hard lines. This approach simplifies assembly for both street drivers and racing teams. Detailed CAD development was performed to align mounting bosses with factory locations and achieve proper fuel rail angles for feed and return lines.
Fuel Delivery System
This kit includes a high-performance 255 LPH Walbro pump designed to support engine outputs up to 550 horsepower. The internal installation reduces noise and prevents vapor separation under rapid acceleration or sustained high throttle runs. The pump delivers consistent pressure directly to LS fuel rails, maintaining optimal injector performance. An enhanced filter sock on the pump improves reliability, while internal spring preload ensures consistent operation under temperature variations. The system maintains calibration when paired with LS engine controllers, delivering precise fuel trimming across all rpm ranges. All hose assemblies and fittings are preconfigured to mate with common engine bay layouts, enabling a plug and play setup with no splices or adaptor fittings.
Material Construction and Reliability
Built from corrosion resistant steel, the tank resists corrosion from ethanol blends and road contaminants while providing exceptional strength. Internal baffling limits fuel slosh in hard cornering or braking events, preserving pump pickup and consistent flow. Sealed electrical connectors and a leak proof seal ensure compliance with emissions regulations and reduce maintenance intervals. Mounting straps are formed from zinc coated steel for corrosion protection, and gaskets are preinstalled to speed up fitment. This tank is compatible with standard fill neck hoses and vent lines, making it a complete solution for any LS based G Body project. Each kit is pressure tested at the factory, and includes straps, gaskets and hardware for a complete installation from delivery to ignition.
To complete your larger capacity fuel pump kit at 400 LPH, consider our 1981-1988 Olds Cutlass 400 LPH Pump Tank Kit.