EFI Sending Unit and In-Tank Fuel Pump for G-Body LS Swaps
For any G-Body LS conversion that demands reliable fuel supply this EFI Sending Unit and Fuel Pump assembly ensures that your stock tank is ready for EFI operation. Direct integration with the factory flange and O ring pattern preserves gauge accuracy and eliminates unnecessary modifications. A precision three eighths inch feed line sender mirrors the original float mechanism for steady readings during all driving conditions. The proven Walbro 255 liter per hour pump sustains consistent pressure under loads up to 550 hp and resists ethanol wear.
Factory Gauge Matched 3/8 Inch Sending Unit
The 3/8 inch feed-line sending unit is engineered to replicate the resistance curve and float mechanism of the original G-Body gauge. Precision machining of the housing maintains tight tolerances, preventing wobble or vibration that could cause erratic readings during cornering or under heavy acceleration. By tapping directly into the factory tank pickup, this unit removes the need for additional adapters and potential leak points, ensuring secure sealing against the original O ring pattern. The snug fit of electrical contacts within the sender housing preserves consistent signal transmission and reliable level reporting every time the ignition is switched on. These design choices allow enthusiasts to retain their stock gauge cluster without calibration or modification hassles.
Walbro 255 Liter Per Hour Pump Supports Up to 550 Horsepower
At the core of this assembly, the Walbro 255 liter per hour pump sustains fuel delivery for engines up to 550 horsepower, avoiding pressure drop even during sudden throttle openings. Tight internal clearances and an efficient impeller design enable rapid system refill after shutdown, reducing cranking time on cold starts. Its construction resists the corrosive effects of ethanol blended fuels, extending service intervals and preserving performance consistency. By maintaining a steady pressure profile under sustained load, the pump helps prevent lean conditions that could stress injectors or engine internals. This focused capability ensures that the fuel system responds quickly and predictably across a wide range of operating conditions.
Direct Compatibility with GM G-Body Tank Flange
This sending unit and in-tank pump assembly mounts directly to the GM G-Body tank using the factory flange and seal interface, accommodating models like Grand National, Monte Carlo, Cutlass and G8 without modification to the shell. Only a few pilot holes are required, allowing installers to secure the assembly quickly while preserving the tank's structural integrity and exterior lines. Reusing original mounting locations and hardware avoids costly welding or custom brackets, and it retains the stock appearance under the vehicle. The straightforward drop-in procedure makes it possible to upgrade an older G-Body from carbureted fuel delivery to modern EFI capability in just a few hours. By integrating seamlessly with existing components, this solution reduces installation complexity and downtime.
Backed by precise engineering and robust design our EFI Sending Unit assembly integrates smoothly and to complete your setup consider our Fuel Fitting Kit for G-Body, a Related FLT product.