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Hi have a 4 cycle troybuilt brush cutter. Having problems with line locations for 3 line primer bulb. Any help would be appreciated.

The model number will make this a lot easier.

:welcome: Welcome to the forum!

I'm going to move this thread over to our Troy-Bilt section.

3 line primer ?

Tank supply to carb
carb outlet to primer inlet
Primer inlet to return line
They all work that way.
The big line in the tank is the return
the thin one ( heavy walled ) is the supply