1978-1988 G-Body EFI Fuel Tank Kit for LS and LT Swaps on Monte Carlo/Malibu/Grand Prix
When converting a 1978-1988 G-Body Monte Carlo, Malibu or Grand Prix for an LS or LT swap, ensuring dependable fuel flow during spirited driving is essential. This EFI fuel tank kit mounts directly to factory frame rails to preserve original flange geometry and align fuel and vent lines without any cutting or welding. Its heavy gauge steel shell incorporates a sealed standpipe pickup and an integrated 400 LPH pump to prevent vapor lock and maintain stable inlet pressure during aggressive cornering. Clear instructions and all necessary hardware support a straightforward installation that keeps focus on the engine build and provides reliable fueling for engines over 550 horsepower.
Precision Fitment for Factory Frame Rails
This fuel tank kit bolts directly to the original frame rails of 1978–1988 Monte Carlo, Malibu and Grand Prix chassis without any cutting or welding. By matching the factory flange geometry it ensures exact alignment of fuel and vent lines, preserving underbody clearance and full suspension travel. Builders benefit from a direct replacement feel that reduces clearance checks around brake lines, exhaust components and crossmembers. This level of precision maintains structural integrity and keeps focus on finalizing the LS or LT engine installation rather than fabricating custom brackets.
Integrated In Tank Pump Module for Stable Fuel Delivery
The heart of this assembly is a 400 LPH Walbro pump enclosed within the steel tank shell to prevent air ingestion and maintain consistent inlet pressure under hard cornering. A sealed standpipe pickup isolates the pump from fuel slosh and vapor lock, even during rapid acceleration or spirited driving. By operating submerged in cool fuel the pump avoids cavitation and temperature spikes, supporting engine outputs above 550 horsepower with immediate throttle response. Internal placement also eliminates external plumbing and reduces potential leak points, delivering a more reliable EFI system on both street and track.
Comprehensive Kit Streamlining EFI Conversion Projects
Every component needed for a complete EFI fuel system update is included, from the pump module and sending unit to filler neck, tank straps, vent filter, gaskets and hardware. Each part is thoughtfully designed to work together and mount using factory holes, eliminating the need for adapters or custom brackets. Clear step-by-step instructions guide through mounting, plumbing and electrical hookup to reduce guesswork and installation time. This all-in-one solution not only accelerates project completion but also maintains high domestic manufacturing standards for consistent quality.
Heavy Gauge Steel Construction for Durability Under Stress
The fuel tank is formed from robust heavy gauge steel that resists corrosion and retains shape under repeated road and track stresses. Precision welding at critical seams and reinforced mounting flanges ensure a leak-free seal and extended service life. This structural integrity withstands thermal cycles caused by fuel heating and cooling while protecting against impact from debris or uneven surfaces. Combined with the integrated pump housing, the single-piece steel design minimizes potential failure points and simplifies future maintenance for demanding LS and LT builds.
Count on MuscleRods for dependable EFI fueling across all LS and LT builds. For a Smaller capacity fuel pump Kit at 255 LPH consider our 1978-1988 Monte Carlo 255 LPH pump Tank Kit.