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Walbro GSL Series Universal Inline Fuel Pumps

Walbro GSL Series Inline Fuel Pumps GSL392

Choose From Five GSL Inline Pump Models:

Part # Rated Flow* Typical PSI Max PSI Max HP (NA)* Max HP (Boosted)* Applications/Notes
GSL392 255 LPH 43.5 psi 87 psi 670 HP 540 HP Great choice for Carb to EFI conversion (Including GM LSx)
GSL394 190 LPH 43.5 psi 87 psi 500 HP 400 HP Great choice for Carb to EFI conversion (Including GM LSx)
GSL391 190 LPH 43.5 psi 50 psi 500 HP 400 HP  
GSL393 155 LPH 43.5 psi 50 psi 405 HP 330 HP  
GSL395 130 LPH 15 psi 20 psi 340 HP 280 HP Low Pressure: GM TBI Engines, Carbureted engines w/return-style regulator

*at typical PSI. Pressure is set by the regulator--not the pump. Flow will decrease somewhat as flow increases. See chart provided for each pump.





All GSL pumps have the same exact dimensions and threading.
The differences in these pumps are in Flow Pressure in PSI and Volume (LPH Liters Per Hour).
GSL series inline fuel pumps range from 115LPH, to 255LPH High Pressure and can be mounted external of the fuel tank.

Walbro inline fuel pumps are ideal fuel pump replacements and upgrades for:

  • Vehicles with faulty inline fuel pumps.
  • Vehicles with expensive or hard to replace in-tank fuel pumps.
  • Vehicles with stock OEM replacement.
  • Vehicles used for racing or performance purposes where higher pressure fuel is necessary, such as GSL392 at 255LPH
  • Universal and custom built fuel systems.

If you are looking to replace your vehicles OE stock fuel pump, you may want to look at the GCL fuel pumps series.
Fuel Pump Cross Reference Guide
provided will make it simple to look up interchangeable part numbers.

If you are looking for a upgrade fuel pump intended for turbocharged, supercharged engines. You should consider using a Walbro 255LPH high pressure pump. One of the most famous and widely of Walbro's universal external pumps is the GSL392 255LPH High Pressure fuel pump. The GSL392 has been extensively used for High performance and Racing applications, and is the most popular universal external pump.

Mechanical Specifications

Outside materials:Aluminum
Terminals (inlet):6/32 threaded brass studs
Inlet Fitting: M 10x1 internal threads
Outlet Fitting: M 10x1 internal threads

Environmental Characteristics

Temperature range: Fluid: -40°C to 65°C (-40°F to 150°F)
Vibration:9 G’s @ 10-55 Hz for 6 hours
Shock:25 G’s
Contamination:8 grams per 100 gallons, 80 micron dust contaminate
Corrosion resistance:96 hour salt spray per ASTM B117
Safe Dry Operation:5 minutes typical 
mounting:In tank or inline (external) 

Inline fuel pump specs:
- OE-proven second generation.
- Fits most EFI applications including turbo and supercharged.
- Variety of pressures and flows available, including high pressure performance.
- All metal shell including inlet and outlet.
- 10mm x 1mm threaded inlet and outlet accept a variety of fittings. 
- The 400-939 kit include two standard universal fittings which can connect to any 5/16 inch hose.
- Lightweight, compact design.
- QS9000 certified.

Per customer needs:Specified by application

A variety of inlet and outlet fittings and install kits are available, allowing for many combinations, and universal compatibility.

Inlet and Outlet Fittings:

  • 128-3012 - Bundy Fitting
  • 128-3014 - 3/8 in Barb
  • 128-3015 - 1/2 in Barb
  • 128-3023 - 10mm Threaded Male
  • 128-3024 - 5/16 in Barb
  • 128-3025 - 12mm OD
  • 128-3026 - 15mm OD
  • 128-3027 - 12mm Banjo
  • 128-3028 - 14mm DIN
  • 128-3039 - AN6 Male
  • 128-3040 - AN8 Male
  • 128-3041 - 12mm Threaded Female
  • 128-3042 - 14mm Banjo
  • 128-3057 - 7/16 in Barb
  • 128-3075 - 12mm Threaded Male

Install Kits:

  • 400-929
  • 400-920
  • 400-939
  • Intank Converter Filter

Sales Help
(888) 511-3039