MS290 two stroking and losing gas

[dallypost]

I just set out to get wood for the winter. MS 290 ran great one month ago. I filled both tanks and fired it up. In the time it took to cut one five inch branch, the saw started running rough. It sounded like it was two stroking like when at full throttle with no resistance, but it kept getting worse. Finally the saw died. I could choke it and pull a few times then restart without a problem. Within about 30 seconds, it started the whole thing again. I thought maybe a bad fuel filter so I opened the fuel cap and was supersized to find that half of the fuel was gone. There is no evidence that gas was running out of the saw anywhere. Could it be in the crank case? Keep in mind that the saw only ran for a total of a few minutes.

 

[HarleyT]

Take off the air filter cover and examine the fuel line under the air filter, look at it closely for cracks.

 

[HuskStihl]

I was supersized to find that half of the fuel was gone. .

I frequently find myself supersized

 

[alexcagle]

Yeah, I had to double take that too. Lol
Wasn't that on the movie Idiocracy?

 

[alexcagle]

Houdini gas.

 

[dallypost]

I fired it back up and ran it for a few minutes. This time I could see gas vapor coming off the saw near the chain sprocket. Removed that cover and noted that all the sawdust underneath was soaked in fuel. Pulled the air cleaner and that compartment fuel soaked as well. Opened the tank and noted again that much more fuel is now gone. Since the fuel line is a suction vs pressure affair, will a cracked line account for all the missing fuel? I was surprised that I was supersized.

 

[HarleyT]

Look at the fuel line.

 

[trboxman]

Make sure that the screws holding the carb together are tight.