1971-1972 Buick Skylark LS and LT Swap Fuel Tank Kit with 400 LPH Pump
Fitting an LS or LT engine into a 1971 and 1972 Buick Skylark A Body chassis demands precise management of fuel delivery and underbody space. This EFI conversion tank kit features a notched contour that clears frame rails, tire sidewalls and exhaust headers without trimming factory sheet metal. An integrated in tank fuel pump module houses a 400 LPH Walbro unit approved for supercharged or over 550 hp applications, while the built in sending unit provides accurate level readings. Complete with tank straps, filler neck, vent filter, gaskets and installation hardware, the kit streamlines the swap process and supports consistent flow under all driving conditions.
Tailored Tank Design
The 1971–1972 Skylark EFI Fuel Tank Kit features a rear tank notch created to match the chassis configuration of those model years. This cutaway profile provides essential clearance for both exhaust system routing and full tire travel, eliminating any chance of interference under load. By adopting this targeted modification, the design preserves suspension articulation and prevents contact between the tank and rotating assembly even during aggressive cornering or heavy acceleration. For restorers and performance builders, this detail ensures the integrity of underbody components without sacrificing vehicle stance or ride height.
Fuel Delivery Performance
At its core, the kit is equipped with a high-output 400-liter-per-hour Walbro pump engineered for applications exceeding 550 horsepower, including forced induction systems. Its flow capacity maintains stable pressure during sustained wide-open-throttle runs, uphill climbs and rapid directional changes. The pump's robust motor and precision-wound armature resist voltage drop, minimizing starvation risk when the fuel level is low or when g forces pull fuel away from the inlet. This level of delivery consistency is crucial for tuners seeking reliable air-fuel ratios under all track and street scenarios.
Installation and Engine Integration
This assembly arrives as a complete internal module contained within the tank shell, enabling a plug-and-play replacement that eliminates the need for external brackets or custom mounting hardware. Compatibility is guaranteed for LS and LT engine swaps in Skylark chassis, and when used with MuscleRods mounts it locks in the correct engine position and drivetrain angles. That partnership ensures the transmission output aligns precisely with the rear axle, reducing vibration and driveline wear. Overall, the configuration accelerates the installation timeline and minimizes post-fitment adjustments.
Monitoring and Control
The kit includes a precision fuel level sending unit calibrated for the original Buick gauge cluster, delivering accurate real-time readings. A sealed float mechanism coupled to a multi-step resistor network eliminates erratic gauge behavior and provides repeatable output even in cornering and braking maneuvers. This level of accuracy is vital for endurance driving and spirited street use, allowing operators to plan refueling stops with confidence. By maintaining exact knowledge of tank volume, the system helps avoid unexpected downtime and supports optimal performance tuning sessions.
To match applications requiring a smaller capacity fuel pump kit at 255 LPH, consider our 1971-1972 Skylark 255 LPH pump Tank Kit (notched).