1961-1964 Chevy Impala B-Body EFI Fuel Tank Kit with 400 LPH Pump for LS/LT swaps
If you’re installing an LS or LT engine into a classic Impala, the original fuel tank soon shows its limits under high demand. This 1961-1964 Impala EFI Fuel Tank Kit features a 400 LPH Walbro pump rated to feed engines over 550 horsepower without fuel starvation during sustained acceleration. It seats directly in the factory well with supplied straps, gaskets and vent filter so no chassis modifications are needed and the original sheet metal and fill spout location remain intact. By placing the pump module inside the tank and integrating a GM style sending unit, this kit delivers consistent pressure and real time fuel level readings for confident driving.
Precision Fit for 1961 to 1964 Impala Chassis
This fuel tank kit is engineered to match the exact contours of 1961 through 1964 Impala frames, ensuring a perfect seating in the stock well without altering any sheet metal. Mounting flanges and filler neck are positioned to align with original points, preserving trunk floor appearance and ground clearance. By maintaining factory spacing to rear suspension components and exhaust, the design also prevents unwanted noise and rubbing under spirited driving. The result is a preserved structural integrity and an installation that respects the vehicle's heritage while upgrading its fueling system.
Efficient Fuel Delivery under Sustained Load
At the heart of this kit is the 400 LPH Walbro pump, calibrated to support supercharged or 550+ horsepower LS and LT powerplants without risk of starvation. Placing the pump inside the tank minimizes heat soak, keeping fuel cooler and denser for efficient combustion during extended wide open throttle runs. Consistent pressure delivery is maintained even when cornering or accelerating hard, so the engine always receives the precise mixture it requires. This reliability makes the system ideal for enthusiasts who demand uncompromised performance from classic Impalas.
Integrated Fuel Level Sensing for Driver Confidence
The built-in sending unit is designed to deliver real time fuel level readings directly to the factory gauge cluster, helping drivers avoid surprise low fuel situations on long cruises or track sessions. Its float arm and electrical impedance mirror stock specifications, eliminating the need for gauge recalibration or complex rewiring. GM style connectors snap into the original harness for a seamless electrical hookup, so installation remains straightforward. Accurate monitoring provides peace of mind whether covering highway miles or tackling back road adventures.
Complete Kit for Streamlined Installation
Every component required for a clean swap is included, from the in-tank pump module and sending unit to heavy duty straps, filler neck, vent filter, gaskets, and all mounting hardware. Pre-measured bolts and precision seals remove the guesswork of sourcing compatible parts, allowing assembly with only basic hand tools. This comprehensive package reduces installation time to just a few hours and eliminates trips to parts counters. By bundling these elements, the kit lets you focus on wiring and tuning instead of hunting down fittings, ensuring a hassle free upgrade.
Trust MuscleRods for precise fit and consistent performance. For a smaller capacity fuel pump Kit at 255 LPH see our 1961-1964 Impala EFI Fuel Tank Kit - 255 LPH Pump.