Dual In-Tank Fuel Pump Module 340LPH w/Return

The Dual In-Tank Fuel Pump Module 340LPH with Return by Holley is engineered for serious enthusiasts who demand reliable, high-flow fuel delivery in modified and performance vehicles. This dual-pump design addresses a critical requirement in upgraded engine builds: maintaining consistent fuel pressure and volume across aggressive throttle inputs and varying load conditions. Whether you're tuning a carbureted classic, retrofitting an EFI system, or maximizing output in a naturally aspirated or forced-induction platform, this module eliminates fuel starvation and delivery inconsistencies that plague undersized OEM systems.

Holley's dual-pump configuration delivers 340 liters per hour of flow capacity, allowing adequate fuel supply for carbureted and EFI applications ranging from moderate builds to high-horsepower engines. The integrated return line regulates pressure precisely, preventing fuel overflow and heat buildup in the tank—a key factor in preventing vapor lock during extended driving and hot-weather operation. The in-tank installation keeps the module sealed and protected from contaminants while minimizing external plumbing complexity. At 6.25 lbs and measuring 9.4 × 6.2 × 12.8 inches, this module fits within standard fuel tank envelopes, making it ideal for both restoration projects and modern performance conversions without requiring extensive fabrication.

This Holley module suits street machines, drag-prepared vehicles, and everyday drivers running modified powerplants that demand more fuel than factory systems provide. Mechanics and builders favor this solution for its plug-and-play design, reducing installation time and ensuring compatibility with Holley carburetors and aftermarket fuel systems. Proper tank preparation and correct fuel line routing are essential for optimal performance; consult your vehicle's fuel system diagram and Holley's installation guidelines to ensure correct return-line configuration and pressure relief settings tailored to your engine's requirements.