Yinlowa 255LPH Inline Fuel Pump Kit — 58 PSI Fixed Regulator, Replaces GSL392, High-Flow for LS Swap

This kit combines a high-flow 255 liters-per-hour external inline pump with a built-in filter-regulator sized for many Gen III/IV LS swap projects. It is designed as a direct-style replacement for common external pump references (GSL392 / 400-939) and mirrors the 58 PSI filter-regulator format used on some OEM returnless rails. The package includes adaptors to help integrate with custom EFI plumbing, but it’s intended for custom installs where hose sizes, regulator layout, and electrical capacity are checked beforehand.

Will this pump deliver enough flow and pressure for my LS swap?

The 255LPH pump provides substantial flow for most single-engine, naturally aspirated LS conversions that require a constant 58 PSI rail pressure. It’s best for standard injectors and typical Z/Gen III fuel demands rather than high-boost or high-horsepower builds that need much higher flow or dual pumps.

• Flow: 255 liters per hour (suitable for many NA LS swaps)
• Pressure: fixed 58 PSI (4 bar) via the included filter-regulator
• Reference compatibility: replaces GSL392 / 400-939 style external pumps
• Not intended as universal bolt-on for all vehicles—verify system needs first

How does the integrated filter-regulator work with a returnless rail?

The included filter-regulator maintains the specified 58 PSI to the returnless rail and sends surplus fuel back to the tank. The regulator also houses a filter element to capture contaminants before fuel reaches the injectors, helping protect the rest of the EFI system.

• Fixed 58 PSI output tailored to returnless LS rails
• Filter element reduces particulates ahead of injectors
• Return port redirects excess fuel to the tank for stable pressure control
• Designed for custom plumbing rather than as a direct universal repair part

What fittings and reference numbers are included for installation?

The kit ships with a selection of common adapters and lists OEM reference numbers to aid fitment checks. Use these references and the supplied fittings to match port directions and hose sizes in your custom fuel plumbing before committing to the purchase.

• Adapters: 3/8 in inlet, 5/16 in return, and 6AN-to-3/8 in outlet
• Pump references: GSL392, GSL392-400-939, 400-939
• Filter-regulator references: WIX 33737, ACDelco GF822, GM 10299146 / 19239926
• Compare port orientation and hose rating with your build before installing

Where should I mount the pump and what installation tips should I follow?

Mount the pump close to and below the fuel tank when possible to help ensure steady feed and reduced heat exposure. Use a suitable pre-filter upstream of the pump, verify wiring and fuse capacity, and follow professional practices for fuel system routing and venting.

• Recommended mount: near and below the fuel tank for reliable suction
• Install a pre-filter ahead of the pump to protect internals
• Confirm wiring gauge, relay, and fuse match the pump’s draw
• Check hose ratings and clamp types for EFI pressures and return plumbing

Who is this for? The Yinlowa 255LPH Inline Fuel Pump Kit suits hobbyists, custom builders, and professional shops undertaking Gen III/IV LS swaps that employ returnless rails requiring 58 PSI. It’s appropriate for typical naturally aspirated LS engines (4.8L, 5.3L, 6.0L) and similar conversions where the installer can confirm hose sizes, regulator layout, and electrical capacity. If you’re planning forced-induction, very high-flow injectors, or a race-only application, evaluate uprated pump options and system design before selecting this kit. Professional fuel-system installation and verification are recommended; the kit is backed by a one-year limited warranty and includes the pump, filter-regulator, and three adapters.