JDMSPEED High-Flow Inline Fuel Pump 255 LPH — External GSL392 Replacement Kit (Universal)

Overview

The JDMSPEED High-Flow Inline Fuel Pump delivers a steady, high-volume fuel supply from an exterior mount. With a 255 LPH rating at 12V and a wide operating pressure window, this pump is a versatile upgrade for engines with performance enhancements. Built for EFI setups, it’s designed to sit outside the tank while supporting a range of fuels and configurations.

Key specifications

• Flow: 255 LPH at 12V
• Design: Inline/External mounting (outside of the fuel tank)
• Operating pressure: 15-120 PSI (final pressure set by regulator)
• Voltage: 12V; performance can be influenced by supply voltage
• Power capacity: May support up to 650 horsepower in suitably tuned setups
• Construction: All-metal shell with durable inlet and outlet fittings
• Replaces part numbers: GSL392-400-939 and related codes
• Compatibility: Universal fit for most EFI applications including turbo and supercharged builds
• Fuel compatibility: Gasoline, pump gas, race gas, diesel, E85, and ethanol blends

What’s included

• 1x GSL392 external fuel pump
• 2x 3/8" hose barb fuel fittings
• 2x crush washers
• 2x electrical connectors
• 2x starlock washers
• 2x nuts
• 2x mounting clamps
• 1x mounting cushion

Use cases and benefits

This pump is well-suited for vehicles with engine or performance modifications where reliable fuel delivery matters. The exterior inline design allows mounting outside the tank, while the universal fit and all-metal construction provide durability in busy engine bays. The broad fuel compatibility enables adaptation to different fueling needs across builds. The 12V operation, combined with regulator-driven pressure, offers flexibility to tailor the system for your configuration without guarantees of specific outcomes.

Installation tips and notes

Plan to use a regulator to set the final pressure and ensure proper voltage to maintain consistent delivery. Follow the included hardware to secure the pump outside the tank and route lines with care to avoid wear. This unit serves as a replacement option for GSL392-400-939 and related models while remaining compatible with a wide range of EFI systems.