1961-1964 Chevy Impala LS and LT EFI Fuel Tank Kit with 400 LPH Pump
When fitting a modern LS or LT engine into your 1961 to 1964 Chevy Impala B Body, consistent fuel supply at demand is essential. This EFI Fuel Tank Kit delivers 400 LPH through a durable in-tank pump and integrates a GM style sending unit for accurate gauge readings under spirited cornering. The tank housing follows the original contours, nesting into the factory well without altering sheet metal and retaining stock strap and fill neck positions. Installation is straightforward with complete hardware and pre fitted gaskets included.
Precision Fitment for 1961 to 1964 Impala B Body
The fuel tank is formed to follow the original underfloor shape of 1961 to 1964 Chevrolet Impala B bodies, allowing it to seat into the factory well without cutting or reshaping any sheet metal. Mounting points for the straps and filler neck align exactly with the original hard points, preserving trunk space and ensuring proper exhaust clearance. The tank maintains the factory distance from the rear axle and suspension components, which prevents any contact that could lead to noise or premature wear under load. By upholding the underbody profile of the Impala, this design merges classic appearance with the demands of modern fuel delivery systems.
Pump Module Placement for Consistent Fuel Pressure
At the heart of the assembly is a 400 LPH Walbro pump mounted inside the fuel tank, a position that shields the module from road debris and chassis vibration while reducing fuel temperature for denser combustion. This internal location keeps fuel pressure steady during rapid throttle transitions and sustained cornering, ensuring LS and LT engines never experience fuel starvation. With capacity to support builds beyond 550 horsepower, the pump meets the needs of both supercharged and high output naturally aspirated configurations. Placing the module in the tank also helps prevent heat soak, which can degrade pump performance and lead to delivery issues over time.
Factory Style Sending Unit for Accurate Fuel Level Readings
The integrated sending unit replicates GM resistance values and float arm geometry to work seamlessly with the original Impala gauge cluster without any calibration or external adapter. Its connector and arm length match the factory wiring harness and tank depth, providing instant compatibility during electrical hookup. Drivers gain real time feedback while cruising or pushing hard, removing the risk of unexpected fuel drops that can interrupt spirited driving. This direct replacement maintains the look and function of the stock instrumentation, giving confidence that readings are always accurate.
Comprehensive Kit Design Streamlines Installation
This all-inclusive system arrives with the fuel pump, sending unit, tank straps, filler neck, vent filter, gaskets and all required fasteners, eliminating the need to source separate parts. Precision seals and pre sized hardware ensure leak free connections from the start, while standard hand tools are all that’s required. Most installations take only a few hours and require no frame modifications, letting builders focus on wiring and tuning instead of part hunting. By combining fitment, plumbing and mounting in one package, the kit accelerates the swap process and delivers a unified solution engineered to perform.
For a smaller capacity fuel pump kit at 255 LPH see our 1961-1964 Impala EFI Fuel Tank Kit - 255 LPH Pump.