255 LPH EFI Fuel Tank Kit for LS Swaps in 1978-1988 G-Body (Monte Carlo/Malibu/Grand Prix)
Taming fuel starvation under heavy acceleration in a 1978 to 1988 Monte Carlo, Malibu or Grand Prix LS swap demands a dedicated supply solution designed for the G-Body frame. This 255 LPH EFI Fuel Tank Kit positions the Walbro pump fully submerged in the original tank to keep fuel cool and prevent vapor formation. It bolts in using factory mount points with the supplied straps, gaskets and matching filler neck for a straightforward installation that preserves chassis geometry and ground clearance. Integrated sending unit delivers precise fuel level feedback to the original gauge cluster while the American steel tank stands up to vibration and corrosion even under 550 horsepower demands.
In Tank Pump Placement for Reliable 255 LPH Delivery
This kit places the Walbro 255 LPH pump fully submerged below the fuel level inside the factory tank to ensure cool operation and continuous flow under extreme engine demand. By keeping the pump immersed, heat soak is minimized and air pockets are eliminated before fuel reaches the injectors. A fine mesh vent filter combined with precision flow passages maintains steady supply during hard acceleration and sharp cornering. This immersion strategy extends pump life and preserves a stable pressure curve even when supporting builds up to 550 horsepower. Technicians benefit from preassembled internal plumbing that aligns perfectly with the original tank aperture.
Architected for Seamless Bolt In Installation on G Body
The kit utilizes the original tank mounting points and delivers all required straps, gaskets, filler neck and hardware for a direct bolt in fit on 1978–88 Monte Carlo, Malibu and Grand Prix frames. No cutting, welding or frame alteration is needed, so chassis geometry and underbody clearance remain factory standard. Installers can follow a straightforward procedure and complete the retrofit in a single day without specialized tools. By preserving the stock fuel line routing and venting layout, this design avoids common fitment issues and reduces installation time.
American Steel Construction for Durability Under Vibration
The fuel tank is fabricated in the USA from heavy gauge steel engineered to resist corrosion and withstand constant vibration on both street and track. Weld seams are precision formed to maintain structural integrity under loads generated by a high torque LS engine and dynamic chassis flex. The robust material resists cracks or leaks even when operating near the 550 horsepower threshold. A durable finish protects the exterior from road debris and moisture, ensuring long term performance in any environment.
Integrated Sending Unit for Precise Fuel Level Monitoring
The built in sending module uses a calibrated float arm tailored to the G Body tank's depth and shape, delivering accurate level readings to the original gauge cluster. By retaining the factory electrical interface, it eliminates the need for aftermarket gauge adapters and preserves dash authenticity. Connector housings are designed to resist corrosion from fuel vapors and lock securely to prevent signal dropout during high vibration. This precise monitoring gives drivers confidence in remaining range and supports tune strategies with real time data.
Count on MuscleRods for lasting performance in your LS swap. To upgrade to a larger capacity fuel pump Kit at 400 LPH see our 1978-1988 Monte Carlo 400 LPH pump Tank Kit.