I My 20-year old Shindaiwa C-35 brush cutter was smoking, puking, cutting out, and wouldn't idle. Every year I had to replace the swinging fuel filter-pickup because the gas had wrecked the EPDM elastomers and caused the tube to tear or collapse thus cutting off the flow of fuel. It cost me $25 every year for a new pickup. I've got several on the shelf.
I just replaced the carburetor on the bushwhacker, put the new gas into it with the new pickup, and it runs better than it has since the first year I had it. I set it up with a string head set to about 14" along with a three point blade for obstructions, which run together takes a lot of power. Then I ran it over two acres of bunch grasses without a hitch. Awesome brush cutter, once again.
I wish I was that handy....would save me a bit of money.