340 LPH LS Fuel Pump and Fitting Kit for GM Vehicles
The 340 LPH Fuel Pump and Fitting Kit is built to cure pressure dips often caused by limited stock plumbing when installing an LS engine into a 1991 to 2005 GM chassis under load. Each precision CNC machined adaptor seals leak free around the factory tank opening while preserving gauge electronics for accurate fuel level and pressure data. Supplemented by internal baffling and a Walbro pump rated for up to 550 horsepower, the kit delivers a consistent 340 liter per hour flow under hard cornering or heavy throttle. Finally the drop in assembly secures neatly beneath rear frame rails using standard hardware.
CNC Machined Adaptors Ensure Secure Tank Seal
Each adaptor is precision CNC machined from high grade aluminum to match the factory tank opening with micron level accuracy. This exacting fit removes the need for additional sealants and prevents leak paths that can lead to pressure loss under load. By aligning perfectly around the OEM opening, the design preserves the original sending unit interface and gauge circuitry for true level and pressure data. Installers benefit from consistent engagement of the threaded spigot and uniform clamp loads, making service access straightforward. The result is a durable, maintenance-friendly connection that upholds fuel system integrity at all rpm.
Engineered Baffling Prevents Fuel Starvation
The internal baffling system divides the tank into multiple chambers to minimize fluid movement during hard cornering, acceleration, or braking. As fuel shifts away from the inlet, the baffling holds a stable column of liquid in the pump pickup zone, eliminating the lean pulses that cause hesitation or misfire. This approach also reduces the chance of vapor lock when the vehicle shifts direction quickly, so throttle response remains crisp. By dampening slosh and providing a consistent head of fuel, the design maintains precise injector operation from idle to redline. Drivers will notice smoother power delivery across the entire rev range without the familiar fuel surge noise.
Walbro 255 LPH Pump Delivers Reliable Flow for 550 HP
The included Walbro 255 LPH unit produces a continuous 340 liter per hour flow rate under dynamic driving conditions, supporting engines rated up to 550 horsepower. Its proven performance curve resists voltage drop effects at high demand, so pressure remains steady under wide open throttle. The integrated 0-30 ohm sending unit is calibrated to OEM gauge electronics, providing accurate level feedback without aftermarket controllers. This synergy between pump output and sensor calibration ensures precise fuel mapping throughout the tune. Technicians find it easier to dial in air-fuel ratios when fuel delivery and instrumentation stay in sync across all temperatures.
Frame Mount Design Simplifies Underbody Installation
The drop-in assembly attaches neatly beneath rear frame rails using existing factory fasteners, eliminating the need for custom brackets or adapters. With an 18 gallon capacity, the tank extends driving range for long haul or track day use without substantial weight gain. Its compact form maintains sufficient ground clearance and avoids interference with suspension travel or exhaust components. Installers appreciate the ability to reuse OE mounting points, cutting labor time while ensuring a solid, vibration-resistant fit. Compatibility with 1991–2005 GM chassis makes it an ideal upgrade for diverse LS swap projects.
Engineered for reliable 340 LPH flow under load and a seamless fit in your LS swap project.