Fuel Tool MC300 Check Valve Rebuild Kit – Fits Harley‑Davidson 2001‑2025 – Replaces Leaking Fuel Check Valves

OVERVIEW

The Fuel Tool MC300 Check Valve Rebuild Kit provides a targeted repair solution for failing or leaking fuel check valves on Harley-Davidson EFI motorcycles, eliminating the need to replace entire fuel line assemblies. Engineered with premium components including DuPont Viton® O-rings, a nickel-plated brass valve, and a stainless-steel spring, this kit restores proper fuel pressure retention and long-term reliability directly within the existing housing.

ENGINEERING & PERFORMANCE

This rebuild kit addresses internal seal failures that cause leaks and improper fuel pressure, restoring secure operation without full system replacement. The sealed assembly combines DuPont Viton® O-rings for superior ethanol and fuel resistance with a solid nickel-plated brass valve body built to resist corrosion and maintain precise closure tension over time. A dedicated stainless-steel spring ensures consistent valve actuation under vibration and heat. When used with the recommended MC400 installation tool, the rebuild can be performed while the fuel tank remains installed, saving significant labor and hardware handling.

KEY FEATURES

• Complete check valve rebuild kit for Harley-Davidson EFI motorcycles
• Fits Harley-Davidson models from 2001 to 2025
• Excludes V-Rod platform applications
• Includes DuPont Viton® O-rings engineered for high ethanol content fuels
• Solid nickel-plated brass check valve core resists wear and corrosion
• Stainless-steel return spring maintains reliable valve tension
• Designed to work with the Fuel Tool MC400 installation tool for tank-on service
• Eliminates the cost and complexity of replacing complete fuel line assemblies
• Proudly manufactured in the USA

TECHNICAL SPECIFICATIONS

• Brand: Fuel Tool
• Part Name: MC300 Check Valve Rebuild Kit
• Part Type: Fuel system component / electrical adjacent repair kit
• Core Materials: DuPont Viton® seals, nickel-plated brass valve, stainless-steel spring
• Supported Years: 2001–2025
• Compatible Trims: Touring, Softail, Dyna, Sportster (V-Rod excluded)

FITMENT

• Harley Touring (2001–2025) • Harley Softail (2001–2025) • Harley Dyna (2001–2025) • Harley Sportster (2001–2025)

WHY HARLEY RIDERS CHOOSE THIS

Riders prefer the Fuel Tool MC300 because it solves a common EFI fuel delivery symptom—intermittent leaks and poor startup—without the expensive teardown required by traditional OEM procedures. The combination of ethanol-rated Viton® seals and a hardened brass valve core directly addresses the degradation that causes repeated failures in stock systems. By enabling a tank-on rebuild alongside the MC400 tool, mechanics and home installers save hours of labor and preserve factory fittings. This focused design delivers lasting pressure stability for everyday riding and extended touring trips when fuel additives and harsh blends accelerate standard seal wear.