TI Automotive (Walbro) 255LPH External Fuel Pump (GSL392)

Universal External Pump for Boosted and High-Demand Fuel Systems

The TI Automotive (Walbro) GSL392 (Cross Reference – EFP-204) is one of the most proven external fuel pumps in motorsport and street performance, flowing 255 LPH with a 60 psi maximum pressure rating — comparable output to a Bosch 044 at 5 bar — and supporting builds up to approximately 600HP, depending on fuel pressure and system configuration. As a pusher-style external pump, it should be mounted as close to the tank as possible and below tank level for reliable fuel feed under load.

Built with an all-aluminium housing for durability and heat dissipation, this fuel pump delivers:

• 255 LPH free flow rate – comparable output to a Bosch 044 at 5 bar
• 10mm x 1.0 female-threaded ports – compatible with barb or AN fitting setups

Flow Chart & Pump Diagram

GSL392 Dimensional Drawing (PDF)
GSL392 Flow Chart (PDF)

Technical Specifications

• Common Names / Cross Reference: Walbro GSL392, EFP-204
• Flow Rate: 255 LPH (67 GPH)
• Horsepower Support: Up to 600 HP, fuel-pressure dependent
• Inlet / Outlet Port Thread: 10mm x 1.0 female thread (both ports)
• Housing Material: Aluminium
• Overall Length: 6.44″ / Outside Diameter: 1.70″
• Mounting Orientation: Pusher-style; mount close to and below the tank
• Certification: QS9000 certified
• Fuel Compatibility: Petrol/Gasoline (not for use with E85)

Includes genuine fitting kit: Mounting brackets and 2x 5/16″ (8mm) barb fittings.