JDMSPEED 255LPH High-Flow External Inline Fuel Pump — Universal 12V, 15–120 PSI for Turbo & Supercharged Engines

This external inline fuel pump is designed to upgrade stock fuel delivery for turbocharged, supercharged, or heavily modified engines. It delivers 255 liters per hour at a 12V supply and works across a wide operating pressure range, with the final rail pressure set by your regulator. The package includes everything needed for a straightforward installation: fittings, washers, electrical connectors, mounting hardware and a dampening cushion.

How does this pump improve fuel delivery for modified engines?

The 255LPH flow rating provides a larger volume of fuel compared with many OEM pumps, reducing the risk of fuel starvation under high boost or high RPM conditions. The metal-shell construction and external inline design make it easy to mount and service without dropping the tank.

• 255 liters per hour flow for stable supply during heavy load
• Supported fuels include gasoline, pump gas, race gas, diesel, E85 and alcohol
• Designed for EFI applications including turbo and supercharged setups
• Can support engines up to approximately 650 horsepower depending on setup

What comes in the installation kit and how simple is the install?

The pump ships with a comprehensive set of fittings and hardware so you won’t need to hunt down extra parts. It’s an inline external mount unit, which generally fits into most fuel lines with basic tools and a few hours of shop time for a competent DIYer or professional mechanic.

• Includes: pump, 2x 3/8" hose barbs, 2x crush washers, 2x electrical connectors
• Also includes: 2x starlock washers, 2x nuts, 2x mounting clamps, 1x mounting cushion
• Mounts outside the tank for easier access and servicing
• Uses standard 12V supply—fuel delivery varies with actual supply voltage

What pressures and fuel types does the pump support?

The pump operates across a broad pressure band (15–120 PSI), letting you rely on your fuel pressure regulator for final settings. It’s built to handle modern fuels used in performance applications, including ethanol blends, which is useful for tuners running E85 or race fuels.

• Operating pressure: 15–120 PSI (set final pressure with regulator)
• Compatible with gasoline, pump gas, race gas, diesel, E85 and alcohol/ethanol
• All-metal shell and fittings for durability in high-flow systems
• Replaces GSL392, 400-939 and related part numbers for easy cross-reference

Will this pump fit my vehicle and engine setup?

The JDMSPEED inline pump is marketed as a universal external unit that fits most EFI systems with standard hose and electrical connections. Confirm inlet/outlet sizes and electrical supply on your vehicle, and consider mounting space and regulator capacity when planning the installation.

• Universal external design installs in-line with existing fuel lines
• All-metal inlet/outlet compatible with common hose and barb fittings
• Check vehicle voltage and regulator compatibility before installation
• Replacement for GSL392-400-939 and similar OEM codes

Who is this for? If you’re upgrading a stock fuel system for higher power, adding a turbo or supercharger, switching to ethanol blends, or replacing a worn external pump, this JDMSPEED 255LPH unit with its installation kit is a practical choice. It’s aimed at DIY enthusiasts, tuners and professional mechanics who want a durable, serviceable external pump that supports higher flow and pressure ranges without major custom fabrication.