LS and LT EFI Fuel Tank Kit 400 LPH Pump for 1978-1988 Monte Carlo/Malibu/Grand Prix
For G Body enthusiasts swapping an LS or LT engine into a 1978-1988 Monte Carlo, Malibu or Grand Prix, maintaining uninterrupted fuel supply at highway and track speeds is an absolute necessity. This kit mounts directly to the original frame rails and places the 400 LPH pump inside the tank to eliminate external modules and simplify fuel plumbing. Engineers retained factory flange geometry for precise fuel line and vent alignment and added a sealed standpipe pickup to prevent vapor lock during hard cornering and support setups above 550 horsepower.
Precision Engineered Fit for 1978 to 1988 G Body Chassis
This fuel tank kit is stamped to match the original frame rails on Monte Carlo, Malibu and Grand Prix models from 1978 through 1988. By retaining factory mounting points and flange geometry, it installs without any cutting or welding, preserving underbody clearance and suspension travel. Precise fuel line and vent hose alignment ensures a plug-and-play fit that moves a project from bench to road in minimal time. The result is an installation that upholds factory specifications while accommodating modern EFI requirements.
In Tank Fuel Pump Design Eliminating Vapor Lock
Housing the 400 LPH Walbro pump entirely inside the tank lowers operating temperature and minimizes air ingestion, key factors in preventing vapor lock under high-g cornering or rapid acceleration. A sealed standpipe pickup isolates the pump inlet from fuel slosh, maintaining constant head pressure and ensuring immediate throttle response. Cooler running conditions and reduced cavitation also extend pump service intervals, delivering reliable fueling even on builds above 550 horsepower.
Complete EFI Conversion Kit for Streamlined Installation
This all-inclusive solution brings together the in tank pump assembly, sending unit, filler neck, vent filter, tank straps, gaskets and all required hardware. Each component is engineered to work in harmony so there is no need for adaptors or custom brackets. Clear instructions guide builders step by step through mounting, plumbing and wiring, resulting in a leak-free system that cuts installation time and eliminates sourcing delays.
Stable Fuel Flow for Demanding Driving Conditions
The high-capacity 400 LPH pump is calibrated to support supercharged and high-output naturally aspirated LS and LT engines pushing beyond 550 horsepower. Its consistent flow profile prevents fuel starvation during spirited cornering and long highway runs, translating into crisp acceleration and steady power delivery. By minimizing cavitation and heat soak, this kit maintains reliable fuel pressure mile after mile, year after year.
Trust this kit to deliver consistent fuel flow on demanding drives. For a smaller capacity fuel pump Kit at 255 LPH see our 1978-1988 Monte Carlo 255 LPH pump Tank Kit.