340 LPH LS Fuel Pump and Fitting Kit for GM Vehicles
Installing an LS powerplant into a 1991 to 2005 GM chassis can reveal stock fuel systems falling short, and this 340 LPH Fuel Pump and Fitting Kit cures low flow under heavy throttle demand. A genuine Walbro unit pairs with precision 3/8 inch, 5/16 inch and 6AN fittings that attach to factory hardlines or aftermarket rails without cutting or splicing. Corrosion resistant anodized aluminum fittings deliver a leak free seal against ethanol blends, and a robust bracket holds the pump assembly at the tank outlet for steady pressure. Technicians appreciate the compact layout with plug in harness ends and simple hose connections for rapid installation during LS or LT engine conversions.
Anodized Aluminum Fittings for Corrosion Resistance and Ethanol Compatibility
Precision machined 3/8 inch, 5/16 inch and 6AN fittings are fabricated from high-quality anodized aluminum to deliver a durable barrier against both ethanol blends and road salt. The conversion coating dramatically increases surface hardness and resists pitting, ensuring each connection remains leak free over thousands of engine hours. By matching factory hardline dimensions, these fittings install without cutting or splicing, preserving the integrity of the original fuel system and reducing the chance of seal failure at joint interfaces. Thermal stability in the anodized layer prevents dimensional change during hot soak cycles, so fittings stay tight under fluctuating temperatures. This combination of materials and surface treatment provides confidence in fuel delivery, especially in climates where moisture and additives pose a constant threat.
Streamlined Bracket Design for Consistent Fuel Pressure
The robust outlet bracket secures the pump assembly directly at the tank's exit flange, shortening the fuel path to minimize pressure drop and eliminate unnecessary hose runs. Its form fits the existing mounting points on GM chassis rails, so installers can reuse stock hardware without custom fabrication or drilling new holes. By holding the pump firmly in place, the bracket prevents vibration or movement that could induce hose fatigue and compromise flow under hard acceleration. The low profile also preserves underbody clearance for steering and exhaust components, making it ideal for tight LS and LT swap environments. Overall, this purposeful design delivers stable pump performance by ensuring the unit remains properly oriented and supported during dynamic driving conditions.
Genuine Walbro 340 LPH Pump Performance in Demanding Conditions
At the core of the kit is a genuine Walbro 340 LPH unit engineered to support high-output LS and LT engines without hesitation. Its internal gerotor design maintains a steady flow rate up to its rated capacity, preventing cavitation during rapid throttle transitions or sustained high rpm operation. The pump body incorporates advanced composites to resist corrosive fuels and reduce internal wear, while the precision tolerances keep pressure steady even at low fuel levels. Mounted close to the tank outlet, the pump benefits from both gravity feed and fluid cooling, extending service intervals and mitigating heat soak. This level of reliability is critical in performance applications where any fluctuation in fuel supply can translate to power loss or engine damage.
Plug In Harness and Simple Hose Connections for Fast Installation
Every electrical lead terminates in a factory compatible connector that mates directly to corresponding plugs on GM LT and LS harnesses, eliminating the need for cutting or crimping wires. Fuel lines slip over barbed fittings sized for common hose diameters, and standard clamp style collars clamp on easily with basic hand tools. This intuitive approach to plumbing and wiring reduces installation time and helps prevent leaks caused by mismatched parts or over tightened fittings. The clear layout and minimal component count also simplify troubleshooting, allowing technicians to trace circuits and hose runs at a glance. By combining these elements, the kit ensures a tidy underbody appearance and a reliable fuel feed that sustains peak engine performance.
This MuscleRods solution ensures consistent fuel delivery and longevity. For the same gas tank but with a smaller capacity pump at 255 LPH see our 1967-1972 Chevy Truck Frame Mount Gas Tank - Side Fill - 255 LPH Pump.