Upgrade Stihl 066 tank vent

[Daniel Haglund]

Hi.

I am using my older style Stihl 066 with my Logosol M8 sawmill. That means that I have my saw tilted to the side all the time. Sometimes it is leaking fuel from the air box. I assume that it is the vent that is leaking when the tank is full.

I looked at the IPL and found two different style tank vents but none are like mine. I just have a filter inside a white cap. It will certainly not hold pressure (tested) nor vaccum (good).

Have any of you successfully upgraded to a newer style tank vent that won't leak or what do you suggest?

Here is what it looks like.

 

[ammoaddict]

Not familiar with the 066 but my 660 was leaking around the fuel line elbow that goes into the fuel tank.

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[Daniel Haglund]

Not familiar with the 066 but my 660 was leaking around the fuel line elbow that goes into the fuel tank.

Yes, that could be it too.

 

[ammoaddict]

I pulled mine out and put a little motoseal around it and it stopped leaking.

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[HarleyT]

Here is a bulletin.

 

[Daniel Haglund]

Here is a bulletin.

Thanks. I actually have the new style valve in the bulletin and it looks fine but perhaps it is just old. According to the bulletin it should allow for pressure to build.

 

[HarleyT]

Yeah, but you can see what you have, is your flapper valve intact?

 

[Daniel Haglund]

Yeah, but you can see what you have, is your flapper valve intact?

Yes, the upside-down umbrella valve looks and feels just fine.

I just tried to hold the saw upside down and I can now confirm that it is leaking from the vent. Not a lot though.