LS EFI Sending Unit and In-Tank Fuel Pump for G-Body
Tackling an LS conversion in a G Body demands a reliable fuel supply and precise level monitoring so this EFI Sending Unit and In Tank Fuel Pump integrates directly into the original tank flange without adapter plates. Matching the stock float mechanism and resistance curve, the 3/8 inch sender maintains gauge accuracy under cornering or rapid acceleration while the Walbro 255 liter per hour pump sustains pressure for up to 550 horsepower and resists ethanol corrosion. Because the assembly bolts onto GM Grand National, Monte Carlo, Cutlass and G8 tanks using the factory flange and seal interface, installers avoid major tank shell changes. Overall, this direct fit setup delivers consistent fuel delivery and reliable gauge reporting for LS swaps in G Body models with minimal installation time.
Precision Fuel Level Sensing in G-Body Tanks
The 3/8-inch sending unit is engineered to replicate the stock float mechanism and resistance curve of G-Body models, delivering factory gauge accuracy even under dynamic driving conditions. By matching the original electrical characteristics, the unit preserves the behavior of the dash gauge without requiring recalibration or aftermarket adapters. Tight machining tolerances and a direct interface with the factory O-ring seal eliminate unwanted movement or vibration that can skew readings while cornering or accelerating hard. This precise fit ensures that drivers receive consistent level data, reducing the risk of running unexpectedly low on fuel during spirited driving or long hauls.
Ethanol-Resistant Walbro Pump for Steady Pressure
The integrated Walbro 255 liter per hour pump is built to support demands up to 550 hp without sacrificing reliability under sustained loads. Its impeller geometry and precisely controlled internal clearances deliver rapid system refill and stable fuel pressure throughout wide throttle changes. Constructed from materials that resist ethanol corrosion, the pump maintains performance over extended service intervals, preventing flow degradation common with high alcohol content fuels. Consistent pressure prevents lean conditions that could stress injectors or engine components, promoting predictable throttle response and protecting powertrain durability.
Factory Flange Integration Simplifies Fitment
This fuel assembly attaches directly to the original tank flange on Grand National, Monte Carlo, Cutlass and G8 applications, eliminating the need for adapter plates or welding. Installers need only reposition a handful of pilot holes to secure the unit while retaining the stock seal interface for leak-free operation. By using the factory mounting locations and hardware, the design preserves the tank shell and original fuel lines, keeping the underbody appearance factory clean. This OEM-level integration reduces custom fabrication time and minimizes potential failure points in the fuel system.
Efficient Installation Preserves Tank Integrity
The assembly fits directly into the tank flange to streamline the transition from carbureted to electronic fuel injection in just a few hours. With minimal shell modifications and reuse of original O-ring seals, installers avoid extensive tank cutting or reinforcement. Preserving the structural integrity of the tank prevents weak spots that can lead to vapor leaks or corrosion over time. The straightforward process helps G-Body enthusiasts complete their swap quickly, returning the vehicle to the road with modern EFI capabilities and reliable fuel delivery.
Trust this assembly for accurate fuel supply and consistent gauge readings. For this sending unit upgrade see our Related FLT product Fuel Fitting Kit for G-Body.