Description
Overview:
The Stihl Fuel Tank Vent (part number 4203 350 5801) is a small but essential component that keeps your blower or shredder running smoothly by allowing air to enter the fuel tank while preventing fuel vapour from escaping the wrong way. Built from fuel‐resistant plastic with an internal one‐way check valve, it maintains correct tank pressure and prevents vacuum build‐up that can lead to poor running. This genuine Stihl part is designed for a wide range of Stihl handheld and backpack machines, including the BG 85 and SH 55. It is a straightforward service replacement for worn or blocked vents, helping restore reliable performance during everyday use in gardens, workshops, and on site.
Key Features:
- Genuine Stihl OEM part for exact fit on listed models
- One‐way breather design maintains tank pressure and prevents vacuum formation
- Helps reduce fuel starvation, hesitation, and stalling under load
- Durable, fuel‐ and oil‐resistant construction with internal check valve
- Easy to install with basic tools; no adjustments required
- Reliable operation across temperature changes and vibration
- Suitable replacement for blocked, perished, or cracked vents
- Supports consistent carburettor fuelling and smoother running
Typical Applications:
Used during routine maintenance or repair of Stihl blowers and shredders when symptoms such as surging, loss of power, or difficulty restarting point to a blocked or failed tank vent. Ideal for restoring dependable operation in domestic gardens, landscaping work, and commercial grounds maintenance where machines run for extended periods.
Also known as:
Tank breather, breather valve, one‐way fuel vent, fuel breather, check valve, ventilation valve, tank ventilation plug.
Fits Models:
BG 45, BG 46, BG 55, BG 65, BG 85, BR 340, BR 340 L, BR 380, BR 420, BR 420 C, SH 55, SH 85, SR 340, SR 420
Alternate Part Numbers:
4203-350-5801, 42033505801
Product Specifications
| L&S Part No. | 4203 350 5801 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42033505801 |
| Unit of Sale | 1 |
| Applications | BG 45, BG 46, BG 55, BG 65, BG 85, BG45, BG46, BG55, BG65, BG85, BR 340, BR 340 L, BR 380, BR 420, BR 420 C, BR340, BR340L, BR380, BR420, BR420C, SH 55, SH 85, SH55, SH85, SR 340, SR 420, SR340, SR420 |
| Machine Type | Backpack Blowers, Blower/Shredders |
| Fits Models | SH55, SH85 | SR 340, SR 420 | BG55 | BG85 |
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