1965-1966 Chevy Impala and Caprice B-Body LS EFI Fuel Tank Kit
Swapping an LS engine into a 1965 or 1966 Impala or Caprice demands a fuel delivery solution that maintains factory underbody styling while supporting over 550 horsepower. This EFI fuel tank kit with its integrated module fits directly into the stock cavity, aligning with original mounting points to eliminate extra brackets and body modifications. Its 400 LPH Walbro pump resists ethanol corrosion and ensures steady flow during wide open throttle runs and sustained cornering demands from powerful LS setups. Installation components like precision gaskets, straps and a replacement filler neck keep bench time to a minimum and preserve that classic sheetmetal appearance beneath the chassis.
Factory Cavity Integration for Seamless Fit
The fuel module is engineered to slip directly into the original tank cavity of 1965 and 1966 Impala and Caprice B Body models, preserving the factory underbody profile without cutting or welding on the shell. By matching Chevrolet's stock mounting points, the assembly installs without extra brackets and maintains the road clearance envisioned by the original engineers. Positioning the pump at an optimized depth within the tank ensures reliable pickup during spirited acceleration, sustained cornering and hard braking events. This approach also keeps the factory corrosion protection intact since the original tank welds and steel finish remain undisturbed. Installers benefit from a design that follows OEM geometry and alignment cues, reducing fitment errors and protecting the resale value of the classic undercarriage.
Steady 400 LPH Flow for Over 550 HP LS Conversions
At its heart, the kit uses a 400 liter per hour Walbro pump calibrated to meet fuel demands of LS swaps surpassing 550 horsepower. Its rotor and stator design hold a narrow pressure band that simplifies regulator tuning and keeps rail pressure rock steady during wide open throttle bursts. Chemically resistant internals stand up to modern ethanol blends, safeguarding service life under sustained high rpm or boost. Compact dimensions allow the pump to nestle securely inside the stock cavity, while consistent flow prevents lean spikes that could lead to engine knock. The result is smooth throttle response and dependable delivery whether on track or during spirited street runs.
Comprehensive Hardware Package for Streamlined Assembly
This all inclusive kit arrives with every piece needed to upgrade the stock fuel system on a 1965 or 1966 B Body, eliminating the need to source items from multiple vendors. Included are a matched sending unit that maintains gauge accuracy, a replacement filler neck styled like the factory part, a vent filter to keep contaminants at bay, tank straps and precision gaskets sized for the original shell, plus zinc plated bolts and brackets for corrosion resistance. Predrilled attachment tabs and clear alignment markers guide both novice and experienced installers through each step. By bundling these components, bench time is slashed and the upgrade delivers professional quality results beneath the chassis.
Preserving Vintage Underbody Aesthetics with Modern Durability
Combining modern performance with classic styling, the kit's durable module respects the Impala's original sheet metal contours and finish. The integrated design leaves the surrounding steel untouched, so the factory paint and rust protection remain effective for years to come. Heavy gauge materials withstand the vibration and flex common to powerful street cars, while the low profile layout aligns with the B Body's original stance. This balance of authenticity and strength ensures that the underbody retains its showroom appeal without sacrificing the reliability required by high output LS setups.
For a smaller capacity fuel pump kit at 255 LPH see our 1965-1966 Impala EFI Fuel Tank Kit - 255 LPH Pump which complements this EFI fuel tank solution.