1968-1969 A-Body Cutlass and Skylark LS and LT EFI Fuel Tank Kit
When fitting an LS or LT mill into a 1968-1969 Cutlass or Skylark A-Body, stock fuel systems often falter and this EFI Fuel Tank Kit with a 400 LPH pump solves that by pairing high-volume flow with integrated baffling. Formed from heavy gauge steel to match original floor contours, the tank bolts to factory frame rails and preserves ground clearance without any welding. Its internal partitions known as Phantom Baffle technology trap fuel near the pickup tube during hard cornering or braking, keeping constant head and preventing air ingestion. The 400 LPH Walbro pump supports supercharged LS and LT builds over 550 horsepower and the complete hardware set including sending unit and gaskets ensures a direct installation path.
Heavy Gauge Steel Structure for Enduring Service
The fuel tank is crafted from robust heavy gauge steel that mirrors the original 1968–1969 A Body floor contours, delivering both strength and exact alignment. Its rigid form resists flex and vibration, preventing fatigue cracks that can lead to leaks over time. By using factory frame rail mounting points and the stock filler neck location, the design retains factory ground clearance and ride height without requiring cutting or welding. This solid construction offers a durable foundation for modern EFI demands and stands up to road debris and everyday driving stresses.
Integrated Kit Components for Seamless EFI Conversion
This complete assembly includes every part needed for a direct fit swap, from the in-tank fuel module and sending unit to the filler neck, vent filter, gaskets, mounting straps, and all hardware. Each component has been engineered to match factory dimensions and tolerances, ensuring a leak-free seal and precise sensor feedback for the engine control unit. Preassembled electrical connectors and pre-cut hoses simplify wiring and plumbing, eliminating guesswork and reducing bench time. Clear instructions guide installers through torque values and routing diagrams, speeding the conversion process and reducing the chance of mistakes.
Phantom Baffle Fuel Control in Vigorous Maneuvers
This tank features internal partitions known as Phantom Baffle technology that form a network of interconnected chambers around the pickup tube. During cornering, braking, or rapid throttle application, the baffling traps fuel near the inlet to maintain constant head pressure and prevent air ingestion. By eliminating fuel slosh and cavitation, the design preserves a stable fuel supply even under sustained lateral loads. The same structure also dampens noise inside the tank, resulting in a quieter cabin experience compared to smooth-walled designs.
400 LPH Pump Capacity for Demanding Engine Builds
At the heart of this kit sits a 400 liter per hour Walbro pump capable of supporting supercharged LS and LT installations over 550 horsepower. Its high flow output keeps the air-fuel ratio within safe limits during hard acceleration and high sustained speeds, reducing the risk of detonation. The pump's robust internal motor runs cooler and with less vibration, extending service intervals under continuous demand. When paired with the factory-matched sending unit, it delivers consistent pressure feedback to the ECU for precise fuel regulation across all driving conditions.
To complete your fuel system upgrade with a smaller capacity fuel pump Kit at 255 LPH see our 1968-1969 Cutlass / Skylark EFI Fuel Tank Kit - 255 LPH Pump and count on MuscleRods for the same precise fit and durability.