1978-1980 Oldsmobile Cutlass EFI Fuel Tank Kit for LS and LT Engine Swaps
When installing an LS or LT engine into a 1978 to 1980 Oldsmobile Cutlass Notchback the stock fuel system cannot sustain pressure during wide open throttle and long high rpm passages so this EFI fuel tank kit integrates a 400 LPH pump into the factory opening for a direct fit solution. Molded gaskets and heavy steel mounting straps ensure a leak resistant seal under vibration and heat while a precision sending unit and integrated vent filter balance tank pressure regardless of ethanol content. With corrosion resistant fittings that plug directly into LS and LT harnesses builders save hours of bench work and maintain the vehicle's original appearance.
High Capacity 400 LPH Pump for Sustained Power Demands
The heart of the Cutlass kit is a 400 LPH Walbro fuel pump calibrated to support supercharged or 550 hp plus LS and LT engines without starving the injectors during rapid throttle transitions. Engineered for continuous duty, the motor and impeller assembly maintain stable flow rates even at high rpm or heat soak. By locating the pump inside the factory tank opening, builders reduce unwanted noise and limit fuel heating from engine compartment heat. This design ensures steady pressure under track conditions as well as spirited street driving. Fuel stays cooler and response remains consistent when the engine is pushed to its limits.
Built for Factory Tank Opening to Simplify Installation
Every component in this kit is dimensioned to drop into the original Cutlass Notchback tank opening, eliminating the need for sheet metal cutting or bracket fabrication. Molded gaskets form a tight seal that resists vibration and adapts to thermal expansion without leaking. Heavy steel straps secure the pump module with even compression across the tank flange, while the filler neck maintains factory alignment and clearances. By avoiding external mounting hardware, builders save hours of mock up and retain the car's stock underbody profile. This approach delivers reliable service life and preserves original sheet metal integrity.
Precision Fitment and Plug and Play Harness Matching
The sending unit and integrated vent filter attach directly to factory mounting points and link to LS and LT harness plugs without adapters or splices. Precision tested components ensure that electrical connectors seat firmly, reducing the risk of pressure drop from loose contacts. The vent filter balances internal tank pressure to prevent vapor lock when the engine encounters heavy loads or extended high speed operation. Together these elements deliver a truly plug and play installation, dramatically cutting bench work and wiring time. The result is a clean setup that looks and functions as OEM intent.
Ethanol Resistant Seals with Corrosion Proof Hardware
Modern pump fuels often contain high ethanol blends that can degrade standard rubber components over time, so all gaskets and sealing surfaces are tested for chemical stability to prevent swelling or cracking. An integrated vent filter maintains consistent pressure regulation under heat soak or sustained high rpm use. Zinc coated fasteners and steel fittings resist rust from road moisture and fuel contaminants, extending service intervals and reducing maintenance costs. These corrosion proof hardware elements deliver dependable performance across daily commutes and competitive driving scenarios. Reliability is critical, and this kit meets that demand.
Count on MuscleRods for reliable fuel delivery. For a Smaller capacity fuel pump Kit at 255 LPH see our 1978-1980 Cutlass Notchback EFI Fuel Tank Kit - 255 LPH Pump.