JDMSPEED 255LPH High Flow External Inline Fuel Pump – Universal GSL392 Replacement, Metal Body & Installation Kit

JDMSPEED 255LPH High Flow External Inline Fuel Pump is a universal external EFI pump and installation kit designed to replace GSL392/400-939 style pumps and support performance engines up to about 650 HP.

If you need a drop-in external fuel pump with higher flow and broad fuel compatibility, this JDMSPEED kit provides a compact metal-body pump, mounting hardware, fittings, and electrical connectors for rapid installation. It’s built to work with gasoline, diesel, E85 and alcohol blends and is intended for vehicles running aftermarket fuel systems, turbocharged/supercharged engines, or any EFI application requiring greater flow than factory pumps.

How much flow and pressure does this pump deliver?

The pump is rated at 255 liters per hour (LPH) with a 12V minimum supply. Operating pressure capability spans 15–120 PSI, although final system pressure is set by your fuel pressure regulator. It's suited for higher-demand setups when paired with the correct regulator and plumbing.

• Rated flow: 255 LPH at nominal voltage
• Voltage: 12V minimum supply — voltage affects actual delivery
• Operating pressure range: 15–120 PSI (regulated externally)
• Supports performance builds up to ~650 HP depending on setup

What components are included and how does installation look?

The kit includes the JDMSPEED GSL392-style external pump plus all necessary small parts to mount and wire it. Mounting clamps, cushion, fittings, washers and electrical connectors make it a straightforward swap into most fuel lines mounted outside the tank.

• Included: 1x external pump (GSL392 form factor)
• Hardware: 2x hose barb fittings, 2x crush washers, 2x starlock washers, 2x nuts
• Mounting: 2x clamps and 1x mounting cushion for vibration isolation
• Electrical: 2x connectors for inline wiring to vehicle harness

Will this pump fit my vehicle and fuel type?

This is a universal external inline pump intended to fit most EFI applications; it replaces common GSL392/400-939 part numbers. It’s compatible with a wide range of fuels but you should confirm hose, regulator, and connector compatibility with your vehicle before fitting.

• Replaces: GSL392, 400-939 and equivalent housings
• Compatibility: gasoline, pump gas, race gas, diesel, E85, alcohol/ethanol
• Fitment: external inline mount — not an IN-TANK pump
• Recommendation: verify electrical supply and regulator capacity before installation

How reliable and serviceable is the pump for performance use?

The JDMSPEED pump uses an all-metal shell for durability and simple serviceability when compared to composite housings. Regular checks of voltage, fuel lines and fittings keep performance steady; if running in harsh environments, inspect mounting and electrical connections often.

• Construction: metal shell with integrated inlet/outlet for durability
• Service tips: monitor voltage under load to ensure rated flow
• Installation tip: use recommended seal washers and secure clamps to prevent leaks
• Performance: designed for turbo/supercharged EFI upgrades and higher-flow demands

Who is this kit for? The JDMSPEED 255LPH external inline fuel pump kit is for DIY enthusiasts, tuners and racers upgrading their vehicle’s fuel delivery. Choose this if you need a universal, higher-flow replacement for GSL392-style pumps, plan to run ethanol or high-octane fuels, or are fitting turbo/supercharged or otherwise modified engines that demand more than the stock pump can supply. It’s not an in-tank replacement — confirm external mounting space, wiring and regulator compatibility before purchase.