The Walbro 255 LPH Inline Fuel Pump is one of the most trusted high pressure EFI fuel pumps in performance and off-road applications. Designed for universal inline installation, this pump delivers 255 liters per hour of consistent fuel flow to support demanding fuel systems. Commonly used in LS swaps, boosted street cars, and off-road race vehicles, the is capable of supporting up to 550 horsepower when paired with proper fuel line sizing and fuel rails. Includes (1) Walbro GSL392 Fuel Pump Specifications Flow Rate: 255 Liters Per Hour (LPH) Pump Type: Inline, High Pressure EFI Operating Voltage: 12V Max Horsepower Support: Up to 550 HP (with proper system design) Fuel Type Compatibility: Gasoline, E85 compatible with proper filtration Installation Type: External / Inline Installation Kit can be purchased here. For best results: Use a 100-micron pre-filter before the pump Use a 10-micron post-filter after the pump Ensure proper wiring with adequate voltage supply Match fuel line size (-6 AN minimum recommended for most LS applications) Fuel system design is critical — pump performance depends on proper filtration, line sizing, regulator setup, and electrical supply. Fitment Universal EFI applications LS swaps Rock crawlers & Ultra4 cars Street performance vehicles Turbocharged and supercharged builds (within flow limits) Designed for inline installation outside the fuel tank. Tech Insight 1. Is the Walbro 255 a good fuel pump for an LS swap? Yes. The Walbro 255 is one of the most commonly used LS swap fuel pumps because it offers an excellent balance of performance, reliability, affordability, and availability. It is frequently used with factory LS fuel rails, aftermarket LS fuel rails, return-style fuel systems, and returnless fuel system plumbing kits. 2. Can this fuel pump be used with a fuel cell? Absolutely. The Walbro 255 inline fuel pump is commonly installed with fuel cells in rock crawlers, rock bouncers, Ultra4 cars, dune buggies, Sand Rails, mud trucks, and custom off-road vehicles. It works well in applications where builders need flexible fuel system routing and dependable fuel delivery. 3. Can I use this fuel pump with a fuel pressure regulator? Yes. The Walbro 255 is commonly paired with an adjustable fuel pressure regulator in return-style fuel systems or a filter/regulator assembly in returnless fuel systems. Proper fuel pressure regulation is critical to maintaining consistent fuel delivery and engine performance. 4. What fuel line size should I use with a Walbro 255? Most LS swap and off-road applications use -6 AN fuel hose with a Walbro 255 fuel pump. This size provides excellent flow capacity for naturally aspirated engines while remaining easy to route and package in custom chassis and off-road vehicles. 5. Can this pump be used with carbureted engines? The Walbro 255 is primarily designed for fuel-injected applications. Carbureted engines typically require much lower fuel pressure and may need a dedicated fuel pressure regulator designed specifically for carburetor use. 6. What is the difference between an inline fuel pump and an in-tank fuel pump? An inline fuel pump mounts outside the fuel tank and is installed directly into the fuel line. An in-tank fuel pump mounts inside the fuel tank. Inline fuel pumps are popular in custom builds because they simplify installation and work well with fuel cells and custom fuel systems.
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