340 LPH LS Fuel Pump and Fitting Kit for 1991-2005 GM Models
Swapping an LS motor into a 1991 to 2005 GM chassis often stalls at the fuel system when factory rail ports and mounts mismatch; the 340 LPH Fuel Pump and Fitting Kit resolves that with precision adapters for return and returnless LS rails. A drop-in bracket secures the pump at the stock mounting point and stainless fittings maintain a secure seal at up to 60 psi. Marine grade stainless hardware resists ethanol corrosion and a calibrated outlet port holds back pressure to prevent cavitation under sustained throttle. An OEM connector wiring harness retains stock trigger logic and eliminates splicing, speeding bench assembly and reducing troubleshooting on the garage floor.
Precision Fuel Rail Interface for Return and Returnless Systems
The adapters in this kit are machined to exceptionally tight tolerances, creating an exact interface with both return and returnless LS fuel rails. Each adapter incorporates durable O‐ring seals that maintain integrity under repeated thermal changes and pressures up to 60 psi. By delivering a perfect seal at each connection point, this design removes the need for hand-formed hard lines and minimizes the risk of leaks or loosening over time. Installers benefit from a streamlined plumbing process that works equally well on factory return rails or modern returnless setups. The result is consistent fuel delivery under demanding driving conditions and a significant reduction in fitment headaches.
Drop-in Bracket Securing Stock Pump Position
This kit includes a bracket that mounts directly to the original fuel pump location on 1991–2005 GM chassis, providing precise alignment without any drilling or chassis alterations. The bracket’s robust steel construction is formed to match factory hole patterns and prevent shifting under engine vibration or road impacts. Its form-lock design holds the pump firmly in place, preserving correct inlet and outlet orientation for optimal performance. By retaining the factory mounting geometry, installers maintain chassis integrity and avoid misalignment that can lead to premature pump wear. This drop-in solution reduces installation time and delivers a professional result that feels factory-installed.
Marine Grade Stainless Fittings Preserving Fuel Pressure
All fittings in the assembly are crafted from marine grade stainless steel, chosen for its superior resistance to ethanol-blended fuels, moisture, and road contaminants. Each fitting integrates a calibrated port that holds back pressure at 60 psi, guarding against cavitation when the engine is under sustained high load. Stable outlet pressure at the pump prevents vapor lock and ensures continuous fuel flow even during prolonged wide-open-throttle operation. Additionally, the corrosion-resistant finish extends service intervals and maintains leak-free connections over time. Together, these fittings deliver reliable performance in the harshest environments and protect your investment in an LS swap.
Plug and Play Harness for True OEM Integration
The included wiring harness features an OEM style connector that mates directly with factory engine wiring looms, eliminating the need for splicing or adapter pigtails. Heavy gauge conductors handle the electrical demands of a 340 LPH pump while the integrated fuse holder provides localized circuit protection. By matching stock trigger logic, this harness prevents error codes and allows the engine control unit to regulate pump activation just as intended by the manufacturer. Thoughtful routing options and heat-resistant insulation minimize exposure to engine heat and abrasion. This fully assembled harness simplifies the electrical side of an LS swap and delivers a clean, dependable connection every time.
Engineered for a precise fit and dependable operation in any LS swap, this kit provides lasting reliability and simplified installation.