MS250 fuel delivery issue?

[vonb]

I have an MS250 which runs strong once started. However, about 2/3-3/4 of the way through a tank of fuel, it starts to act like it's running out of gas and quits. I then open the cap and notice it has about 1/4-1/3 tank of fuel still remaining. If I shake the saw, after fuel starvation, it starts back up.

What could be the issue here? All lines are original and about 15 years old.

 

[HarleyT]

Look at the fuel line, they usually go bad and develope cracks.

If so, replace, and go through the carb too, as gunk will be in there.

 

[Andyshine77]

The line is likely stiff as well, maybe not even sitting on the bottom of the tank. New line, filter and carb kit.