066 Question

[Wolfcsm]

Ran into a problem today. After two tanks of gas in a short period, in temperatures of around 100, when I opened up the gas cap to refill the saw, the gas in the bottom of the tank was boiling. When I filled the saw and tried to restart it , it would not start. After about half an hour of sitting the saw started and ran like normal.

Can anyone suggest something I might do or look at? Other than the obvious - why whould you be cutting wood in 100 degree temps.

Thanks,

Hal
Killeen, Texas

 

[NeTree]

Vapor lock?


Erik

 

[Bob Wulkowicz]

Originally posted by Wolfcsm
Ran into a problem today. After two tanks of gas in a short period, in temperatures of around 100, when I opened up the gas cap to refill the saw, the gas in the bottom of the tank was boiling. When I filled the saw and tried to restart it , it would not start. After about half an hour of sitting the saw started and ran like normal.

Can anyone suggest something I might do or look at? Other than the obvious - why whould you be cutting wood in 100 degree temps.

Thanks,

Hal
Killeen, Texas

First, I know you Texans are forbidden by law to say that the temperature down there is ever over a hundred. Don't want to scare away any tourists or new gullible residents.

If the gas tank is unvented, or if any vent is plugged, a sudden release to atmosphere will get the liquid abubbling, just like opening a soda bottle and having it boil for a while. If the tank was in the sun, the temp could be pretty high, and a hot bottle of soda will be pretty explosive in its boiling.

That level of vapor pressure is outside the design range of most everything, and they won't start.

The boiling will last for a while, but I would have thought it would end more quickly and not let you see it. Another Texas miracle.


As to not starting there, it depends on the carburation design of the beast. The closest example could be vapor lock in your truck. The solution is to let it cool down like you did.

http://www.icsbestway.com/gc_site/techsupport/starting_the_saw.shtm

Then again, what do I know?


Bob Wulkowicz

 

[Bob Wulkowicz]

Try reading my debris about how trees work and the new arborculture. That oughta start your tank bubblin'.


tubs

 

[Tom Dunlap]

I had some saws that would vapor lock. When that happened we'd set the garden hose on a trickle and leave the saws in the puddle. That cooled them down quickly. But it also gave me an excuse to have more saws "just in case"

I think that you might richen the mixture just a little to cool the cylinder.

Tom

 

[Ryan Willock]

I think Bob has just amazed us all!!!

 

[Wolfcsm]

Thanks to all. The answers about vapor lock are right on for the description. Will try and be more patient with starting it.

Kind of hard to avoid the 100 degree temps here. By 10 this morning it was 95 and by 2 in the afternoon it was 102.

Thanks to all

Hal