LS and LT Fuel Tank Kit for 1978-1988 G-Body Monte Carlo/Malibu/Grand Prix
If you are setting up an LS or LT engine swap in your 1978 to 1988 Monte Carlo, Malibu or Grand Prix this EFI fuel tank kit with a 400 LPH pump delivers the steady fuel flow needed for both spirited street driving and sustained track use. Mounted directly to the factory frame rails, it preserves original flange geometry and aligns fuel and vent lines without any cutting or welding. By housing the 400 LPH pump within a heavy gauge steel shell and sealed standpipe pickup the design prevents vapor lock and maintains stable inlet pressure even under high lateral loads. Installers appreciate the direct replacement fit that minimizes clearance checks around brake lines, exhaust components and crossmembers so attention stays on the engine rather than on fabrication.
Seamless Integration with G Body Frame Rails
This EFI fuel tank kit installs directly onto the original frame rails of 1978–1988 Monte Carlo, Malibu and Grand Prix chassis without any cutting or welding. By preserving the factory flange geometry it aligns fuel and vent lines in their intended positions, eliminating underbody clearance issues and maintaining full suspension travel. The heavy gauge steel shell is engineered to match OEM mounting points, reducing the need for mock-ups around brake lines, exhaust components and crossmembers. Installers benefit from a straightforward bolt-in process that protects structural integrity and keeps the focus on finishing the LS or LT engine installation rather than on custom fabrication.
Submerged Pump Design for Consistent Fuel Pressure
At the heart of the assembly is a 400 LPH Walbro pump fully enclosed within the steel tank, ensuring reliable inlet pressure even under aggressive cornering. A sealed standpipe pickup isolates the pump from fuel slosh and prevents vapor lock during spirited driving or track sessions. Running immersed in cool fuel helps avoid cavitation and temperature spikes, so the pump can support supercharged or naturally aspirated LS and LT engines producing over 550 horsepower. Internal placement also removes external plumbing runs and reduces potential leak points, delivering dependable EFI fueling from startup through sustained wide-open-throttle operation.
Complete EFI Fuel System Kit for Streamlined Assembly
This all-in-one solution includes every component needed for a modern EFI conversion: the 400 LPH fuel pump module, sending unit, filler neck, tank straps, vent filter, gaskets and all mounting hardware. Each item is purpose-designed to bolt into factory holes without adapters or custom brackets, and clear step-by-step instructions guide installers through mounting, plumbing and electrical connections. By combining precision-fit parts with detailed guidance, the kit accelerates project timelines and minimizes guesswork. The result is a fully integrated fuel system that keeps LS and LT swap builds focused on engine performance rather than on sourcing components or troubleshooting leaks.
For a smaller capacity fuel pump Kit at 255 LPH see our 1978-1988 Monte Carlo 255 LPH pump Tank Kit and trust in a precise fit built for reliable EFI fueling.