The STIHL Fuel Cap – 4128 350 0505 is a genuine OEM replacement fuel tank cap designed for select STIHL handheld outdoor power equipment, including chainsaws, brushcutters, trimmers and blowers. Engineered to ensure a secure, leak-free seal on your fuel tank, this fuel cap helps maintain proper fuel system pressure, prevent contamination and support reliable engine performance in a variety of operating conditions.

Manufactured to STIHL’s original equipment standards, the 4128 350 0505 fuel cap features durable materials and precision-molded components that resist wear, cracking, fuel exposure and environmental stress. Its accurate fit and threaded design ensure dependable sealing and easy installation — outperforming many generic alternatives in long-term durability and compatibility.

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Key Features

• Genuine STIHL OEM Part – Built to original STIHL specifications for dependable performance and precise fitment.

• Secure Sealing Design – Helps prevent fuel leakage and protects the fuel system from contaminants.

• Durable Construction – Manufactured from high-quality materials that resist aging, fuel vapours and impact.

• Easy Installation – Threaded design allows quick hand-tightening and removal without tools.

• Part Reference: 4128 350 0505 – Confirms correct OEM fuel cap identification.

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Suitable Machines / Compatible Equipment

The STIHL 4128 350 0505 Fuel Cap is used on a range of STIHL petrol-powered handheld equipment where this specific fuel cap reference is specified in the official parts catalogue.

Typical compatible machine platforms include:

• STIHL chainsaws

• Brushcutters and trimmers

• Handheld blowers and other two-stroke garden power tools

(Exact fitment depends on the model and production year — always consult your machine’s parts diagram or operator’s manual to verify compatibility.)

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Typical Compatible Applications

This fuel cap is commonly fitted to:

• Petrol fuel tanks on STIHL chainsaws

• Fuel systems on trimmers and brushcutters

• Fuel tanks on handheld blowers and similar equipment

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Parts This Cap Replaces / Supersedes

As the genuine OEM replacement fuel cap, the 4128 350 0505 often corresponds to alternate reference formats found in parts listings, such as:

• 4128-350-0505 (alternate hyphen notation)

• Equivalent STIHL fuel cap references in specific regional catalogues

(Note: part references can vary by region — always verify with the official parts list for your machine.)

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Fitment Tip

Fuel caps must match the thread size, seal design and tank neck diameter specified for your STIHL equipment. Before ordering, identify your exact model number and consult the official STIHL parts diagram to confirm that the 4128 350 0505 fuel cap is correct for your machine. Correct selection ensures a secure polish, proper sealing and reduced fuel loss.

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Product Details

Product Type: Fuel Tank Cap
Part Reference: 4128 350 0505
Location: Fuel tank opening
Material: Durable fuel-resistant plastic and seal
Function: Seals the fuel tank, prevents leakage and protects against contamination

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Why Choose This Fuel Cap

The STIHL 4128 350 0505 Fuel Cap is the dependable choice when replacing a cracked, worn or missing fuel cap on compatible STIHL outdoor power equipment. Its genuine construction ensures accurate fitment, secure sealing and long service life — helping maintain proper fuel system integrity and reduce downtime compared with generic alternatives.