1965-1966 B-Body Fuel Tank Kit for LS Swaps in Impala/Caprice
Owners upgrading their 1965 or 1966 Impala or Caprice to LS power often find the original fuel tank falls short under increased demand. The 1965-1966 Impala EFI Fuel Tank Kit 400 LPH Pump installs a self contained pump module in the stock B Body cavity to maintain factory clearance and underbody styling. Predrilled mounting tabs, straps, gaskets and hardware speed installation while the robust design delivers consistent 400 LPH pump flow to support over 550 horsepower applications. By matching factory mounting points this kit ensures reliable fuel pickup during cornering or full throttle runs without altering classic Chevy B Body lines.
Factory Cavity Integration for Stock B-Body Tanks
This kit positions the pump module inside the factory cavity of the 1965 or 1966 Chevrolet Impala and Caprice fuel tank to maintain original underbody lines. By aligning with the stock mounting points, the assembly requires no additional brackets and preserves the correct clearance from the road. The pump sits at an ideal depth within the tank to sustain fuel pickup under hard cornering and heavy acceleration. Corrosion protection remains intact because no cutting or welding is required on the original steel tank shell. Installation errors are minimized since the design follows the original tank geometry and clearance specifications.
Steady 400 LPH Walbro Pump Flow for LS Power
The Walbro pump supplied with this kit provides a consistent 400 liters per hour fuel flow to meet the demands of LS setups over 550 horsepower. Its robust internal design maintains steady fuel pressure even during sustained wide open throttle runs, reducing the risk of lean conditions that can lead to engine damage. Drivers benefit from smooth throttle response and consistent performance whether cruising or launching from a stop. Calibration of fuel pressure regulators is simplified since the pump operates within a narrow pressure envelope. Its corrosion resistant housing is engineered to handle modern ethanol blends without degradation.
All-inclusive Hardware Package for Faster Fitment
This package includes every component needed to upgrade your Impala or Caprice stock fuel system without sourcing additional parts. Alongside the 400 LPH pump and internal module, it supplies the sending unit, replacement filler neck, vent filter, straps, gaskets and all required mounting hardware. Predrilled attachment tabs and clear alignment features simplify the installation sequence, eliminating guesswork and cutting bench time. Original underbody appearance is preserved due to the in tank location of all new components. Even technicians with minimal tank experience can achieve a proper seal and correct orientation on their first attempt.
Built to OEM standards for reliable fuel delivery; for applications needing a smaller capacity fuel pump Kit at 255 LPH see our 1965-1966 Impala EFI Fuel Tank Kit - 255 LPH Pump.