EFI Fuel Tank Kit with 400 LPH Pump for 1981-1988 Oldsmobile Cutlass LS/LT Swaps
Swapping an LS or LT powerplant into a 1981-1988 Oldsmobile Cutlass demands a fuel system that matches rapid throttle shifts and long runs at power. This EFI fuel tank kit features a 400 LPH Walbro pump to maintain steady pressure up to 550 hp while its reservoir shape combats vapor lock and fuel aeration during hard cornering. Complete sending unit, filler neck, straps and mounting hardware follow factory mounting points and original line routing to streamline installation and avoid fabrication delays. By preserving chassis geometry and eliminating guesswork installers can focus on final tuning instead of custom fabrication.
Steady Fuel Supply with 400 LPH Walbro Pump
The integrated 400 LPH Walbro module delivers consistent fuel flow that keeps pace with the demands of an LS or LT drivetrain. By maintaining precise pressure even under hard acceleration and high rpm cruising, the pump supports builds beyond 550 hp without dropping below the required threshold. This capacity is especially critical for supercharged applications where fuel starvation can lead to detonation and engine damage. Electronic injection systems rely on this level of flow to achieve accurate mixture control and prevent lean events. This consistency enhances throttle response and safeguards internal components during spirited driving sessions in the Cutlass swap.
Tank Geometry Designed to Prevent Vapor Lock and Aeration
The unique internal reservoir shape and pump positioning reduce turbulence and eliminate air pockets that can lead to vapor lock or fuel aeration. Under hard cornering or extended highway runs, this design maintains uninterrupted flow by keeping the pump consistently submerged in fuel even when lateral forces shift the liquid. It also mitigates the effects of heat soak in the rear chassis area by promoting constant contact between fuel and pump; this avoids pressure drops when ambient temperatures climb. The result is stable fuel pressure for reliable engine performance under all driving conditions.
Vehicle Specific Fitment for 1981 to 1988 Oldsmobile Cutlass
Every aspect of this fuel tank follows the original Cutlass mounting geometry to ensure a direct fit without modification. CAD guided forming aligns the filler neck with the stock inlet and positions vents to clear the body panel while avoiding contact with suspension components. Steel straps mirror the factory thickness and anchor points, preserving underbody ground clearance and chassis rigidity. By eliminating the need for adapters or trimming, installers maintain the structural integrity of the frame and accelerate project timelines with confidence.
Complete Hardware Integration for Efficient Installation
This kit includes all necessary components, from the in tank pump module and calibrated sending unit to custom tank straps, filler neck, vent filter, molded gaskets and stainless hardware. The sending unit is pre calibrated for EFI precision, ensuring accurate fuel level readings for the stock gauge cluster. Custom straps and gaskets are engineered to OEM spec for a leak free seal and consistent venting performance. Matching factory fuel line routing and using quality parts streamlines the assembly process, prevents trips for missing items and cuts labor time on every LS or LT conversion.
This MuscleRods fuel tank is designed for lasting reliability and ease of installation. For a smaller capacity fuel pump kit at 255 LPH see our 1981-1988 Olds Cutlass EFI Fuel Tank Kit - 255 LPH Pump.