1964 Pontiac GTO LS EFI Fuel Tank Kit with 255 LPH Pump
When fitting a modern LS powerplant into a classic 1964 Pontiac GTO, the fuel system must support precise pressure and volume demands without altering the car's underbody lines. By placing the Walbro 255 LPH pump entirely inside the reservoir, this EFI Fuel Tank Kit with 255 LPH Pump uses surrounding gasoline as a natural coolant and reduces cavitation under sustained acceleration. Complete with an OEM style sending unit calibrated for factory dash gauges and all mounting hardware, installation avoids custom adapters and preserves the GTO's authentic look. The direct fit assembly retains the stock filler neck placement and vent filter so chassis modifications are minimized while delivering consistent flow rates for LS engines up to 550 horsepower.
Submerged Pump Cooling Enhances Fuel Delivery
The Walbro 255 LPH pump is fully enclosed inside the Pontiac's tank to leverage surrounding gasoline as a cooling medium. By operating in a submerged environment, the pump stays at a stable temperature even during long runs, preventing heat soak that can reduce flow. Keeping the motor under liquid also cuts cavitation when demand spikes, ensuring continuous delivery under sudden throttle input. This layout further dampens noise and vibration compared to an externally mounted unit, producing a quieter cabin. Tailored to the GTO’s tank geometry, the assembly rides securely and picks up fuel consistently at all fill levels.
Precision Sending Unit for Accurate Gauge Integration
The calibrated sending unit mimics the original fuel resistance curve so factory gauge readings remain true during cornering and braking. Installed with matching connectors and a plug-and-play harness, it eliminates the need for splicing or adapter modules, cutting wiring time. Each unit is pretested to ensure the stock dash cluster responds without recalibration, giving drivers confidence in level feedback under hard acceleration or steep grades. By preserving the factory circuit design, this solution maintains the GTO’s authentic instrumentation feel without compromise.
OEM Replacement Components Simplify Installation
All mounting hardware and tank straps are fashioned to original reference dimensions, slotting into factory points without cutting or trimming. The formed filler neck aligns with the stock opening to preserve underbody lines, and a direct-fit vent filter guards against airborne contaminants. Pressure tested gaskets and seals ensure a leak-free assembly, while included bolts and clips match factory spec for drop-in ease. This cohesive kit approach streamlines the swap process, letting enthusiasts spend less time on fabrication and more time behind the wheel.
Fuel Flow Capacity Matched to 550 Horsepower Engines
Engineered to support LS powerplants up to 550 horsepower, this tank kit delivers the steady high volume needed for modern electronic fuel injection. The in-tank pump sustains rail pressure under peak load, preventing lean spots that can lead to detonation in boosted or high compression applications. By matching fuel supply capabilities to engine output, throttle response remains sharp even during spirited driving or extended track use. This consistent delivery not only protects internal components but also unlocks the full potential of a high output LS swap in a classic GTO.
For a larger capacity fuel pump Kit at 400 LPH consider our 1964 Pontiac GTO EFI Fuel Tank Kit - 400 LPH Pump for consistent delivery under high demand.