EFI Fuel Tank for LS Swap in 1965-1966 Chevy Impala/Caprice B Body
When fitting an LS engine into a 1965-1966 Chevy Impala or Caprice B Body, maintaining steady fuel delivery at 550 hp or more demands a robust in tank solution. The Impala EFI Fuel Tank Kit with 400 LPH Pump installs inside the stock cavity to preserve original clearance and uses a 400 LPH Walbro pump rated for supercharged or over 550 hp use. Complete with sending unit, filler neck, tank straps, vent filter, gaskets and hardware, it aligns with OEM mounts on Impala and Caprice frames and delivers consistent rail pressure under sustained acceleration while retaining factory geometry and corrosion protection.
Integrated Tank Module
The 1965 to 1966 Impala EFI Tank Kit features a pump module that installs directly into the stock tank cavity. This design preserves trunk space and stock mounting points while eliminating external hardware clutter. Precise engineering aligns the module with original stampings to maintain proper fuel height. Integration with MuscleRods mounts ensures correct engine placement and drivetrain angles for reliable operation under load.
High-Performance Fuel Delivery
The 400 LPH Walbro pump delivers exceptional pressure and flow to support modern power levels. Its capacity prevents fuel starvation during sustained high rpm and heavy acceleration. By maintaining consistent fuel pressure, the system safeguards against lean conditions that can jeopardize engine health. This kit exceeds the limits of standard pumps to serve supercharged or over 550 hp applications.
Engineered for Extreme Output
Durable construction and corrosion resistant materials define the strength of this kit. Laser cut components and precision welds ensure airtight seals and long life in harsh environments. The assembly handles high pressure demands and resists wear over thousands of miles. Designers focused on reliability to give enthusiasts confidence on both street and strip without altering the car's original character.
Seamless LS Conversion Compatibility
This fuel tank kit is optimized for LS engine installations in 1965 and 1966 Impalas. It matches factory filler neck location and retains original sheet metal clearance, allowing direct use of existing body panels. By following OE dimensions, it integrates without modification to the chassis or frame rails. The result is a clean, out of sight installation that blends modern EFI performance with vintage styling.
To complete your Smaller capacity fuel pump Kit at 255 LPH, consider our 1965-1966 Impala EFI Fuel Tank Kit - 255 LPH Pump.