STIHL MS 170 Leaking Gas
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
91%
CONF
|
Fuel Line
The MS 170 utilizes a molded rubber fuel line that acts as its own bulkhead seal where it exits the fuel tank. Over time, exposure to ethanol-blended fuels causes the elastomer to shrink and lose its elasticity, compromising the interference fit between the line and the tank wall. This results in fuel weeping from the tank, especially when the unit is tilted during horizontal felling cuts.
SKU: 1130 358 7700
|
|
|
5%
CONF
|
Fuel Tank Vent
The tank vent is a small valve assembly designed to allow atmospheric air into the tank to prevent vacuum lock while blocking fuel from escaping. If the internal diaphragm or porous stone becomes gummed with fuel residue or the housing cracks, it will allow fuel to leak out of the top of the tank housing. This is particularly noticeable when the saw is stored on its side or during high-vibration operation.
SKU: 0000 350 5800
|
|
|
4%
CONF
|
Fuel Filler Cap
The fuel cap relies on a rubber gasket to provide a liquid-tight seal against the tank neck. Repeated torque cycles and chemical exposure lead to compression set in the gasket, preventing it from conforming to the sealing surface of the tank. Replacing the entire cap assembly ensures a new gasket and a functional locking mechanism to prevent leaks at the fill point.
SKU: 1130 350 0500
|
DIY Repair Guide
Watch exactly how to replace the Fuel Line.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.