Yinlowa 255LPH Inline Fuel Pump Kit — 58 PSI Filter-Regulator for LS Swap, GSL392 Replacement

The Yinlowa 255LPH Inline Fuel Pump Kit is a complete external pump and 58 PSI filter-regulator assembly designed for returnless Gen III/IV LS swap fuel rails, replacing GSL392-style pumps.

This kit combines a 255 liters-per-hour 12V external inline pump with a fixed 58 PSI filter-regulator so you can feed a returnless LS fuel rail that expects 4 bar pressure. It’s built for custom EFI plumbing on swap projects and conversions—particularly 4.8L, 5.3L and 6.0L LS installs—but requires you to confirm plumbing, hose sizes, electrical capacity and pre-filter placement before installation. The package includes common adapters and a one-year limited warranty; professional fuel-system installation is recommended.

Will this work for my LS swap with a returnless rail?

Yes, when your fuel rail is designed for a fixed 58 PSI supply and your plumbing matches the included ports. This assembly mirrors the C5 Corvette-style filter-regulator layout and replaces GSL392-type external pumps used in many LS conversions.

• Fixed 58 PSI (4 bar) output tailored to returnless LS rails.
• 255 LPH pump capacity suitable for many street and light performance engines.
• Includes 3/8 in inlet, 5/16 in return, and 6AN-to-3/8 in outlet adapters.
• Confirm rail pressure spec, hose diameter and plumbing orientation before buying.

How do I install it and where should the pump be mounted?

Mount the pump low and close to the fuel tank when possible and use a dedicated pre-filter ahead of the unit. Proper electrical feed, a solid ground and fuel-rated hose/clamps are essential for reliable operation; follow professional installation practices for safety and performance.

• Mount pump below and near the tank to ensure good inlet suction.
• Use a high-quality pre-filter upstream of the pump to protect the internal strainer.
• Match wire gauge and fuse to the pump’s 12V current draw and routing needs.
• Secure fittings and check for leaks under pressure after plumbing is complete.

What do the included adapters and references mean for compatibility?

The kit’s adapters and part references help you compare this assembly to common OE and aftermarket parts. Cross-reference the listed numbers and adapter sizes with your current components to verify fitment and avoid incompatible hose or port orientations.

• Replaces GSL392 / 400-939 style external pumps (common retrofit reference).
• Filter-regulator cross-references include WIX 33737 and ACDelco GF822 for comparison.
• Adapters: 3/8 in inlet, 5/16 in return, and 6AN-to-3/8 in outlet for common plumbing setups.
• Compare port direction and thread sizes to your rail and hoses before purchase.

What maintenance and precautions should I follow?

Routine inspection and replacing the pre-filter will prolong pump life and keep contaminants away from injectors. Because this is a high-pressure fuel component, always use fuel-rated hoses, proper clamps, and have a qualified technician perform pressure checks and final tuning.

• Replace upstream pre-filter at regular intervals based on use and fuel quality.
• Inspect fittings, hoses and electrical connections after initial runs and periodically.
• Do not use this kit as a universal repair—ensure compatibility with your system layout.
• Follow local regulations and safety practices when working with fuel systems.

Who is this for: This Yinlowa pump-and-regulator kit is aimed at enthusiasts and professional installers building or upgrading Gen III/IV LS-based EFI projects that require a fixed 58 PSI supply to a returnless rail. It suits swap builders installing 4.8L, 5.3L or 6.0L engines, custom conversion shops, and anyone replacing a GSL392-style external pump—provided plumbing, electrical capacity and hose choices are correct. If you need a different pressure or a return-style system, choose a component matched to those requirements.