1978-1980 Oldsmobile Cutlass LS and LT EFI Fuel Tank Conversion Kit with 400 LPH Pump
Swapping an LS or LT engine into a 1978 to 1980 Oldsmobile Cutlass Notchback calls for a fuel assembly that maintains steady pressure through rapid throttle transitions and sustained high rpm operation. The kit combines a 400 LPH pump with a precision sending unit and vent filter housed within the factory tank to deliver consistent flow without cutting or modifying original mounts. Molded gaskets and heavy gauge steel straps secure the module using stock mounting points for a true plug and play installation. Rigorous testing with ethanol blends and repeated flow cycles confirms dependable operation from daily driving to track sessions.
Optimized 400 LPH Walbro Pump Module for Sustained Delivery
The built in 400 LPH Walbro pump ensures a stable flow rate under rapid throttle changes and extended full throttle driving. Its continuous duty design supplies up to 550 hp engines with the volume required to prevent lean conditions that can lead to detonation or stress on injectors. The internal impeller and motor components are precision matched to resist pressure drop even at high rpm operation and under thermal load. By integrating the pump into a module that fits inside the factory tank location, builders gain a reliable solution that aligns with LS and LT fuel system requirements without the need for added fuel lines or external hangers.
Direct Factory Tank Fitment and Seamless Harness Integration
Every element of this assembly is dimensioned to seat directly into the original Cutlass tank opening, eliminating cutting or welding that can weaken sheet metal structure. The sending unit and vent filter attach to existing mounting points and connect to LS LT harness plugs without adapters or splices, delivering true plug and play installation. Heavy gauge steel straps provide uniform clamp pressure while molded gaskets form a vibration resistant seal that holds tight against pressure and temperature changes. This approach preserves the vehicle s factory appearance and alignment and streamlines bench work by reducing potential fitment errors.
Ethanol Resistant Seals and Vent Filter for Reliable Operation
Modern pump fuels often contain ethanol blends that can degrade standard rubber components over time. All gaskets and sealing surfaces in this kit are evaluated for chemical resistance to prevent swelling, hardening or failure due to ethanol exposure. The vent filter maintains proper tank breathing by balancing internal pressure with ambient conditions to avoid vapor lock when the engine is under heavy load or during high temperature episodes. Zinc coated hardware and steel components resist corrosion from moisture and road contaminants, extending service intervals and preserving consistent pressure delivery. With these elements combined, the assembly ensures dependable operation from daily drives to track use.
This assembly is engineered for consistent pressure delivery under all conditions. To complete your Smaller capacity fuel pump Kit at 255 LPH see our 1978-1980 Cutlass Notchback EFI Fuel Tank Kit - 255 LPH Pump.