LIYYOO Fuel Pump for Kohler Magnum Engines — Replaces 5255901/5255902 with Fittings & Snap‑Ring Tool

LIYYOO's fuel pump kit replaces Kohler 5255901/5255902/5255903-series pumps to restore reliable fuel delivery on KT17, KT19, M18, M20, MV16, MV18 and MV20 engines.

If your Kohler-powered mower, generator or utility engine is running rough, stalling, or hard to start, a worn or failing fuel pump is often the culprit. This LIYYOO kit is designed to match the fit and function of the original Kohler parts (52-559-01, 52-559-02, 52-559-03-S and related numbers) while including extra fittings and installation tools so you can complete the swap with minimal downtime.

How does this kit restore engine performance?

The pump moves fuel from the tank to the carburetor at the correct pressure and timing so the engine receives a steady, metered flow. Replacing a weak or leaking pump prevents lean runs, hard starts and intermittent stalling without altering engine tuning.

• Direct replacement shape and mounting for Kohler KT/MV series engines.
• High-flow construction resists common fuel contaminants.
• Includes gaskets and O-ring to ensure a sealed installation.

What comes in the LIYYOO fuel pump kit and what are the installation extras?

The kit is packaged with the pump and the small parts you'll need so you don't hunt for hardware. LIYYOO adds a snap-ring installation tool and multiple fittings to adapt to different fuel line sizes, making the swap straightforward for DIY mechanics.

• 1 fuel pump, 1 snap-ring installation tool, 1 O-ring and 1 gasket.
• 7 fittings covering 1/4", 5/16" and 3/8" inner-diameter fuel lines.
• 2 inline fuel filters and 2 washers to complete the job.

Which Kohler part numbers and engines will this replace?

LIYYOO engineered the pump to replace common Kohler OEM numbers and fit Magnum series small engines used in lawn and garden equipment. Confirm your engine model and OEM part number against the list before ordering for a correct match.

• Replaces Kohler OEM 52 393 17, 52 559 01, 52 559 02, 52 559 03-S and variants.
• Compatible with Kohler Magnum M18, M20, MV16, MV18, MV20, KT17, KT19 engines.
• Also fits equivalent aftermarket references such as Stens and Ariens numbers cited.

Will installation require special tools or modifications?

Most installations are bolt-on with no permanent modifications required; the included snap-ring tool simplifies removal and installation of the pump assembly. If you follow the engine service manual and use the supplied seals and fittings, the job is usually completed with basic hand tools.

• Snap-ring tool included for safe removal/installation.
• Use the provided O-ring and gasket to prevent leaks; no RTV should be necessary.
• Adapters allow connection to 1/4", 5/16", or 3/8" fuel line without cutting new hose ends.

Who this is for: This LIYYOO fuel pump kit is aimed at owners and technicians maintaining Kohler KT and Magnum-series small engines—mowing professionals, backyard mechanics, and rental fleet managers—who need a durable, ready-to-install replacement that matches OEM fitment and includes the accessories required to finish the repair in one visit. It is not a universal pump; verify your engine model and part number list before purchase.