Walbro GSL392 255 LPH High-Pressure External Inline Fuel Pump 650+ HP Universal

Vehicle Fitment

• Universal - No vehicle-specific fitment. Designed for external/inline mounting in any custom, race, performance, or EFI fuel system requiring a high-pressure, high-flow inline fuel pump. Compatible with turbocharged, supercharged, and naturally aspirated applications up to 650-670 HP on gasoline.

Fitment Notes

• This is a universal external inline fuel pump. It must be mounted outside the fuel tank, in the fuel line between the tank and the fuel rail. It is NOT designed for in-tank installation.
• This pump is for use with gasoline only. It is NOT compatible with E85, methanol, or other alternative fuels.
• A 20-40 micron pre-filter MUST be installed between the tank and the pump inlet to prevent contamination damage. A 10-micron post-filter between the pump and the fuel rail is also strongly recommended.
• Inlet and outlet are M10 x 1.0mm internal threads. Two 3/8 in. hose barb fittings are included. AN fittings are available separately.
• Current draw is 20A - verify wiring and relay capacity before installation. A dedicated relay and properly fused wiring is required for safe operation.
• CAUTION: The GSL392 has an extremely high counterfeit rate. Purchase only from authorized Walbro/TI Automotive dealers. Genuine pumps feature laser-etched (not sticker) labeling and clear Walbro branding on the packaging.

Features

• 255 LPH (67 GPH) high-pressure flow rate - supports up to 650-670 HP on naturally aspirated applications; effective for turbocharged and supercharged builds at comparable wheel horsepower levels
• High-pressure output up to 87 psi - far exceeding standard OEM fuel system pressure requirements, suitable for demanding EFI and boosted applications
• Proven 2nd generation OE-style gerotor design delivers reliable, consistent fuel delivery with minimal pulsation
• Lightweight, compact all-aluminum body - 43mm diameter, 118mm body length, 160mm overall length - minimizes installation footprint in tight engine bays and custom fuel systems
• M10 x 1.0mm threaded inlet and outlet accept a wide variety of fittings for flexible installation in any fuel line configuration
• Includes two 3/8 in. hose barb fittings for immediate use with standard rubber fuel line
• QS9000 certified manufacturing for verified quality and consistency
• Can be paired with a second GSL392 for even higher flow applications requiring dual-pump setups
• Made in the USA by TI Automotive under the Walbro brand
• The most popular and widely trusted universal external fuel pump in the performance aftermarket for decades

Specifications

• Part Number: GSL392
• Brand: Walbro / TI Automotive
• Pump Style: External Inline (out-of-tank), Electric
• Pump Design: Gerotor (2nd Generation)
• Flow Rate: 255 LPH (67 GPH)
• Maximum Rated Pressure: 87 psi
• Current Draw: 20A
• Voltage: 12V
• Body Diameter: 43mm (1.70 in.)
• Body Length: 118mm
• Overall Length: 160mm (6.44 in.)
• Inlet Fitting: M10 x 1.0mm internal threads
• Outlet Fitting: M10 x 1.0mm internal threads
• Included Fittings: Two (2) 3/8 in. hose barb adapters
• Terminals: 6/32 threaded brass studs
• Body Material: Aluminum
• Weight: 17.4 oz
• Fuel Compatibility: Gasoline only (NOT for E85, methanol, or ethanol blends)
• Maximum Supported Horsepower: 650-670 HP (NA)
• Certification: QS9000
• Fitment Type: Universal
• Country of Origin: USA
• Warranty: Walbro / TI Automotive Limited Manufacturer's Warranty

Included Components

• 1x Walbro GSL392 255 LPH High-Pressure External Inline Fuel Pump (aluminum body)
• 2x 3/8 in. Hose Barb Fittings (M10 x 1.0mm thread)

Product Description

The Walbro GSL392 is the most iconic and widely used universal external inline fuel pump in the performance aftermarket. For decades, it has been the benchmark 255 LPH high-pressure pump for builders, tuners, and racers across every platform - from turbocharged sport compacts to naturally aspirated V8 builds. Flowing 255 liters per hour and capable of generating up to 87 psi of fuel pressure, the GSL392 supports naturally aspirated builds up to 650-670 HP and remains a foundational component in boosted applications requiring reliable, consistent high-pressure fuel delivery at higher power levels. The proven 2nd generation gerotor pump design delivers smooth, pulsation-free flow with the reliability that has made Walbro synonymous with performance fuel systems.

The compact aluminum body - 43mm in diameter and just 160mm overall - makes the GSL392 easy to package in tight custom fuel systems, engine bays, and race car fuel cell configurations. The M10 x 1.0mm threaded inlet and outlet accommodate a wide range of fittings, including the included 3/8 in. hose barb adapters for immediate rubber-line hookup, as well as aftermarket AN fittings sold separately. Two GSL392 pumps can be paired in series for applications requiring fuel volumes beyond a single pump's capacity. The pump draws 20A at full load, requiring a dedicated relay and properly rated wiring harness for safe, reliable operation.

Important installation requirements: a 20-40 micron pre-filter must be installed upstream of the pump inlet at all times to protect the internal components; an additional 10-micron post-filter between the pump outlet and the fuel rail is strongly recommended. This pump is designed for gasoline use only and is not compatible with E85, methanol, or ethanol fuel blends. Due to the GSL392's widespread popularity, it has one of the highest counterfeit rates of any aftermarket fuel pump - purchase only from an authorized Walbro/TI Automotive dealer. Genuine pumps feature laser-etched labeling on the body. Universal fitment - no vehicle-specific installation hardware is included. Made in the USA. QS9000 certified.