660 gas tank leak

I was using my 660 today noodling some uglies. Everything was working fine, then suddenly stalled. Was able to restart then a small fire started around the gas tank. I got it out and invested. I found the spark plug had puked from the cylinder, I figured that was the problem, so replaced it and attempted to start the saw, no go.

Upon further investigation I noticed a slow gas leak between the gas tank and orange part of the saw along the seam. A very small amount of gas slow builds up along the seam. would this be the problem? And what’s the solution?

 

Is the tank vent leaking?

 

Possible, how do you check the tank vent for leaks?

 

If it doesn’t leak when placed bottom side down and does leak when the saw is on it’s side, than it’s probably the vent. Is it an aftermarket tank on your saw? On my 044 I can see the tank vent when the air filter cover is off.

 

im more curious about the spark plug coming out

 

May have to invest in a new tank?

 

Appears to be the tank vent. I set the saw on its side a it started dropping right away.

so do I just need to replace the tank vent?

 

Chud any suggestions on changing the vent? Just don’t want to pull it to hard a break something

 

So no problem getting the tank vent off. After looking for a replacement vent online I see that it is missing the white part of the vent which I’m assuming is the valve that keeps it from leaking gas. Not sure how that could have went missing, or if it’s been gone since I’ve had it and never caused a problem.

 

Are after market tank vents OK or should I check with my dealer for OEM?

 

I would just go with oem unless the price is astronomical or not available.

 

For sure, just thinking if it’s not available. I can’t imagine an ORM would be over $20 if the dealer has one.

 

1122 tank vents have changed throughout the series. If you have the 660 style that fits the grommet, go with an oem replacement.
If you have the earlier style with the 064 type grub screw (unlikely), then the AM Echo-type are an improvement.
You can fit the Echo type on a lot of saws with slight modifications and some fuel line. Rarely… say 1/20, I’ve seen an AM Echo vent not work out of the package. They last a while despite having rubber components inside that plastic housing.

 

The AM vents around with the grommet (your pic) are basically the Echo style. I would wonder how well the grommet will seal after long term exposure to gas. All cheap AM fuel hoses will eventually fail, in my experience. They’re lacking something in the chemistry of the rubber.