AUMEL Fuel Cap Kit for Stihl FS Series 2-Pack, OEM-Style Leak-Resistant Replacement

AUMEL's 2-piece fuel tank cap kit is a direct-fit replacement for Stihl models that use part 4128-350-0505, providing leak-resistant sealing and simple, tool-free installation.

This pair of OEM-style fuel caps is engineered to match the original Stihl fit and function so your string trimmer, brushcutter, or edger resumes reliable fuel containment and ventilation. Manufactured for quick swap-outs, the caps help prevent spills, reduce evaporation, and keep dirt out of the fuel system. The kit includes two identical caps, making it convenient to service multiple machines or keep a spare on hand.

Will this cap fit my Stihl model?

Yes — the AUMEL caps are made to replace Stihl part number 4128-350-0505 and are compatible with a wide range of FS-series units. Check your original cap or parts list to confirm the part number matches before purchasing.

• Direct replacement for 4128-350-0505
• Compatible with many FS models including FS38, FS45, FS55, FS80, FS85, FS120, FS200, FS250, FS300, FS350, FS400, FS450 and more
• Includes 2 caps — useful for multi-unit owners or as a spare

How easy is installation and maintenance?

Installation is straightforward and requires no special tools. The caps are engineered for a snug twist-on fit and routine removal for refueling or inspection.

• Tool-free installation: twist and lock design
• Quick to remove for refilling and visual fuel checks
• Durable materials resist wear from regular handling

What performance benefits should I expect?

Replacing a worn or damaged fuel cap improves fuel containment and supports proper tank ventilation, helping the engine run consistently. While not a performance enhancer by itself, a good cap prevents fuel loss and contamination that can lead to starting issues or inconsistent running.

• Reduces fuel leakage during transport and operation
• Helps keep dirt and moisture out of the tank
• Supports correct tank venting to avoid pressure-related issues

What does the package include and what support is provided?

The kit ships with two fuel caps and is packaged for immediate installation. AUMEL offers customer support to address fitment or product questions, with a stated response window for inquiries.

• 2 x fuel tank caps per package
• Precision-engineered components for easy assembly
• Customer service available for fitment help and returns

Who is this for: This 2-piece AUMEL fuel cap kit is designed for homeowners, landscapers, and small-scale contractors who use Stihl FS-series trimmers and brushcutters and need a reliable, affordable replacement part. It suits anyone maintaining older equipment, keeping a spare cap on hand, or replacing a damaged or leaking fuel cap to ensure safe refueling and consistent tool operation.