1961-1964 Chevy Impala B-Body LS and LT EFI Fuel Tank Kit with 400 LPH Pump
Converting a 1961 to 1964 Chevy Impala B body to LS or LT power brings the challenge of consistent fuel delivery under high demand. The Impala EFI Fuel Tank Kit with 400 LPH pump is shaped to nest directly in the factory well and preserve original strap and fill neck locations for a hassle free swap. Featuring a 400 LPH pump and integrated GM style sending unit the assembly ensures steady flow and accurate gauge readings through sharp turns and spirited driving. Complete hardware and pre fitted gaskets make installation swift without any sheet metal alterations.
Precision Fitment for 1961 to 1964 Impala Underbody
The EFI Fuel Tank Kit is engineered to follow the exact contours of the 1961 to 1964 Chevy Impala B body undercarriage, allowing the unit to seat into the factory well without altering any sheet metal. Mounting points for the filler neck and strap assemblies align precisely with the original Impala layout, preserving trunk clearance and ensuring proper exhaust routing. Factory spacing from the differential and rear suspension remains unchanged, which prevents any contact that can lead to noise or wear under load. By retaining the stock geometry, the assembly upholds the vehicle's classic underfloor design while meeting modern performance needs.
Efficient Fuel Delivery with 400 LPH Walbro Pump
At the heart of the kit is a 400 LPH Walbro pump capable of supporting supercharged or 550-horsepower‐plus LS and LT engines without risk of fuel starvation. Locating the pump inside the tank reduces heat soak and keeps fuel at a lower temperature for denser combustion and stable flow. Continuous pressure is maintained even during hard cornering or rapid throttle transitions, ensuring the engine always has sufficient volume on demand. This internal position also shields the pump from road debris and chassis vibration, which extends its service life and reliability.
Integrated Fuel Level Monitoring with OEM Accuracy
The built-in sending unit mirrors GM factory resistance values so the original Impala gauge cluster reads accurately with no additional calibration. Its float arm and connector are designed to interface seamlessly with the OEM wiring harness, making the electrical hookup straightforward. Drivers benefit from real-time fuel level feedback whether cruising or pushing hard, eliminating unexpected drops that can interrupt spirited drives. This direct replacement solution preserves the look and function of the stock instrumentation panel.
Comprehensive Hardware Kit Simplifies Installation
This all-inclusive assembly ships complete with the fuel pump, sending unit, tank straps, filler neck, vent filter, gaskets and all required mounting hardware. Precision seals and pre-measured fasteners eliminate the need to source individual pieces, so builders can complete the swap using standard hand tools. In most installations, the new tank slides into place in just a few hours without any frame modifications or cutting. By handling fitment, plumbing and mounting in one package, this kit streamlines the swap process and lets enthusiasts focus on wiring and tuning instead of part hunting.
Trust this MuscleRods kit to deliver dependable supply even under spirited use. For a smaller capacity fuel pump kit at 255 LPH see our 1961-1964 Impala EFI Fuel Tank Kit - 255 LPH Pump.