I had the chainsaw out today taking down a dead tree for my neighbor next door. While it initially ran well, it began to acted starved for fuel, but would restart after it died. Opening and resealing the fuel cap didn't correct the issue. It almost seemed that position was key at first, as it would run well for some cuts, then when held in a different position it would die again. Finally, though it died and refused to restart. At that point I noticed that the primer bulb would depress, but would not fill again. I'm thinking clogged tank or fuel line, but would like some opinions. Don't chainsaws have "floppy" pickups that tend to stay at the bottom of the tank? Do chainsaws have fuel pumps? Are the filters inside the tank and is there any good way to get to the tank. It is a Homelite model, nothing special.