EFI Fuel Tank Kit 400 LPH Pump LS and LT Swaps in 1961-1964 Chevy Impala
If you plan a 1961 to 1964 Chevy Impala LS or LT conversion, tackling fuel starvation starts now with the Impala EFI Fuel Tank Kit with a 400 LPH pump. This complete assembly seats directly in the B Body well and ships with straps, gaskets and a vent filter to preserve original sheet metal and fill neck placement. At its core, the 400 LPH Walbro pump delivers steady flow for engines up to 550 horsepower without overheating or pressure loss. An integrated GM style sending unit ensures accurate fuel level readings on the factory gauge cluster under varied driving conditions.
Precision Alignment for 1961 to 1964 Impala Fuel Tank
The Impala EFI Fuel Tank Kit is shaped to follow the exact curves of a 1961 to 1964 Chevy Impala B body undercarriage, ensuring the new assembly seats without altering any sheet metal. Mounting points for the filler neck and strap assemblies match original locations so trunk clearance and exhaust routing remain unchanged. Factory spacing from the differential and rear suspension is preserved, avoiding contact and reducing noise under acceleration. Such careful fitment upholds the vehicle's historic design while supporting modern engine requirements.
Efficient Fuel Supply under Heavy Demand
At the core of the kit, the 400 LPH Walbro pump can sustain engines rated over 550 horsepower without risk of fuel starvation. By placing the in-tank pump module, heat soak is minimized and fuel stays cooler for denser combustion during long runs. Continuous pressure is delivered even in sharp turns or rapid throttle changes, so LS and LT powerplants receive the volume they require. This internal location also extends pump life by isolating it from external vibration and debris.
Integrated Fuel Level Monitoring
The built in sending unit replicates GM factory resistance characteristics to drive the original Impala gauge cluster without calibration changes. Its float arm and wiring connectors align with the OEM harness, making the electrical hookup straightforward. Drivers benefit from continuous fuel level readings under all road conditions, whether cruising or accelerating hard. Accurate information on tank contents prevents surprises and instills confidence on long trips or spirited back road drives.
Complete Kit for Streamlined Installation
Every necessary component arrives in one box, from the pump module and sending unit to tank straps, filler neck, vent filter, gaskets and mounting hardware. Precision seals and pre measured fasteners eliminate the hassle of sourcing parts, allowing assembly with only standard hand tools. In most cases, the updated tank can be installed in a few hours with no frame modifications. This comprehensive approach frees builders to focus on wiring and engine tuning instead of tracking down fittings.
This kit delivers consistent fuel flow and precise level feedback under varied driving conditions. For a smaller capacity fuel pump Kit at 255 LPH see our 1961-1964 Impala EFI Fuel Tank Kit - 255 LPH Pump.