My 540A skidder been using it last 3 days on a downhill slope yesterday acted like it was running out of fuel. It didn't even have the power to pull itself back up it kept dyeing even after adding more fuel it didn't help but got it to the barn, then it started running fine when back on a level surface. This morning went back out and dragged out 10 trees and it started doing same thing. After getting back on level surface it still kept on dyeing I noticed the glass filter didn't have much fuel in it. Had to start every few minutes to move 5 feet at a time. When finally got it parked the glass filter was full of fuel. It has a rubber gas line on it which may be the problem or not? Could it be a fuel line collapsing or a clog down by the tank? If so by tank how can I fix it?