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Description
4128 350 0505 STIHL Filler Cap – Genuine OEM Part
The STIHL Filler Cap (4128 350 0505) is a genuine OEM replacement fuel tank cap designed for use on a wide range of STIHL trimmers, brushcutters, KombiSystem units, blowers, and specialty equipment. This filler cap seals the fuel tank opening securely, helping prevent fuel leaks, contamination, and evaporation during operation and storage.
Manufactured to STIHL’s exact specifications, this OEM filler cap ensures proper fitment, reliable sealing performance, and long-lasting durability when replacing cracked, leaking, or missing fuel caps.
Product Details
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OEM Part Number: 4128 350 0505
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Brand: STIHL (OEM)
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Part Type: Filler Cap / Fuel Tank Cap
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Application: Fuel Tank Assembly
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Condition: New Genuine OEM Part
Function
This filler cap is designed to:
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Seal the fuel tank opening securely
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Prevent fuel leaks and evaporation
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Protect fuel system from dirt and debris contamination
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Replace worn, cracked, or missing fuel caps
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Maintain safe and reliable equipment operation
⚠️ A damaged fuel cap may cause fuel leakage, starting issues, or unsafe operation.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
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OEM part number 4128 350 0505
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Part location: fuel tank filler opening
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Compatible STIHL model listed below
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits a wide range of STIHL equipment, including:
Trimmers / Brushcutters
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FS 38, FS 38 2-MIX
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FS 45, FS 45 D, FS 45 C-E
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FS 46, FS 46-D, FS 46 C-E, FS 46 C-E D
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FS 48, FS 52
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FS 55, FS 55 R, FS 55-D, FS 55 R-D
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FS 55 RC-E, FS 55 RC-E D, FS 55 C-E D
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FS 56 (4125)
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FS 66, FS 66 R
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FS 72 R, FS 74, FS 75, FS 76
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FS 80, FS 80 R
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FS 81, FS 85, FS 85 R, FS 85 RX
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FS 86
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FS 106, FS 108
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FS 120, FS 120 R
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FS 200 R
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FS 235.0, FS 235.0 R
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FS 250, FS 250 R, FS 250.0, FS 250.0 R
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FS 350
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FS 450-K
KombiSystem Units
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KM 55 R, KM 55 R-D
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KM 55 RC-E, KM 55 RC-E D
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KM 85 R
Hedge Trimmers / Long Reach Units
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HL 45, HL 45-D
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HL 75, HL 75 K
Pole Pruners
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HT 70, HT 75
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HT 250
Blowers
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BG 72
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BG 75
Clearing & Backpack Units
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FR 108
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FR 235.0
Specialty Equipment
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FC 55, FC 55-D
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FC 75
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FC 85
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FC 55
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BT 120 C, BT 121
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KW 85
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MM 55, MM 55 C-E
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SP 200
⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.
Installation / Usage
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Turn off engine and allow it to cool completely
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Remove the old fuel cap from the tank opening
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Inspect the tank neck and sealing surface for debris
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Install the new STIHL OEM filler cap securely
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Tighten properly and check for leaks before operation
Maintenance Tips
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Inspect fuel caps regularly for cracks or seal wear
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Replace leaking caps immediately to prevent fuel hazards
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Keep fuel tank opening clean during refueling
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Store equipment properly to reduce cap deterioration
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Use only genuine STIHL replacement parts for best fit and reliability

