1964-1967 Oldsmobile Cutlass LS EFI Fuel Tank Kit with 255 LPH Pump
Swapping an LS engine into a first generation Cutlass demands a reliable fuel source under sudden throttle changes and this 1964-1967 Cutlass EFI Fuel Tank Kit solves that need with its 255 LPH pump. With a direct fit design that uses factory trunk mounts, the assembly installs without modifying body panels or frame rails. Drivers will appreciate precise level readings from the OEM style sender and steady pressure from the US made Walbro unit, all while preserving the Cutlass underbody appearance. Installation bypasses any cutting or welding and integrates venting components to prevent vacuum lock during spirited cornering.
Direct Fit Installation Preserving Original Trunk Architecture
This fuel tank kit drops into the 1964-1967 Cutlass trunk cavity using the factory mounting points, eliminating any need to cut body panels or alter frame rails. Careful engineering of the tank contours and bracket locations ensures that the assembly aligns precisely with the original anchor spots, preserving the classic underbody profile beneath the trunk. Because the filler neck and vent plumbing are designed to match the stock openings, the installation remains clean and uncluttered, maintaining the car's heritage appearance. This direct fit approach not only speeds up the swap process but also safeguards resale value by keeping the chassis unmodified and OEM compliant.
Consistent Fuel Pressure from 255 LPH Walbro Pump
At the heart of this kit is a US built Walbro pump rated at 255 LPH, capable of supporting an LS engine output up to 550 HP without cavitation or pressure drop. By locating the pump inside the tank and immersing it in fuel, the design maintains steady pressure even during rapid throttle transitions or high-g cornering. This stable flow reduces the chance of lean spikes under acceleration and ensures a crisp throttle response as the injector pulse width stays consistent. In everyday driving the efficient delivery also contributes to better fuel economy, since the pump runs smoothly without drawing excess current.
Precision Fuel Level Sender for Reliable Gauge Accuracy
Accuracy of the fuel gauge is critical when converting to electronic fuel injection on a classic chassis. The integrated sender unit in this kit features a high-tolerance potentiometer and float arm calibrated to the Cutlass fuel tank geometry. This arrangement provides precise feedback to the dash gauge, eliminating false lows or erratic needle movement that can occur with generic replacements. Drivers gain confidence from knowing exactly how much fuel remains, which is especially important on spirited outings or long highway runs. Maintenance is simple since the sender is part of the modular pump assembly and can be serviced without dropping the tank.
Integrated Venting System Preventing Fuel Starvation
Fuel starvation can occur during hard cornering or climbing steep grades if air cannot escape the tank as fuel is drawn out. This kit addresses that issue with an integrated vent filter and custom-sized filler neck that allow air to flow freely while blocking debris and moisture. The vent filter element is mounted outside the tank to simplify inspection and replacement, and it connects directly to the filler neck for a compact routing inside the trunk. By balancing internal pressure, the venting system protects pump life and ensures uninterrupted delivery to the engine under all driving conditions. Enthusiasts can push their LS swap to its limits without worrying about unintended fuel interruptions.
Count on MuscleRods for reliable flow and fit; to upgrade with Larger capacity fuel pump Kit at 400 LPH see our 1964-1967 Cutlass EFI Fuel Tank Kit - 400 LPH Pump.