1/8" or 3.175mm
SOURCE: Troy Bilt TB 465SS Pony 4 cycle weed trimmer won't start
Sounds like you need to take the carb. apart and clean it. I like to use a Den Tek Brush, (used for cleaning teeth), to clean the small ports in carb. they work great for this job. Make sure to either clean or replace the small screen in thcarb. as well.
Jim
SOURCE: Fuel line size for troy built TB20CS weed eater
You probably have found the solution by now I would assume... TB won't tell you this because they want you to buy their stuff..
You probably are looking at the 0.08" diameter that's just a bit smaller than the 3/32". Hope this helps....
SOURCE: What is the fuel line size for Troy Bilt TB525CS Trimmer?
Yes, something special to know. If the new fuel line is going into the gas tank, be sure to cut a steep angle on the end of the line going into the gas tank. This will allow enough of the line to get into the tank where you will be able to grab it thru the gas fill opening with needle nose pliers and pull it thru.
Testimonial: "Thanks for the tip, I will try that when I find out the fuel line size."
SOURCE: changed fuel line on my troy-bilt gas trimmer
the fuel thank have 2 lines the one is close to you facing out is the pick up line this line has a fuel filter inside the tank, thats mean go thru the carburator or adapter coupling thru the carburator in the bottom. The second line is the return line this line go thru the prime valve on the bottom and the top line go thru the top line tube in the carburator.
SOURCE: troy bilt tb70ss replaced fuel lines trimmer turns
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. The larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.
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