Knowing the make and model will help. Some saws have a primer bulb that will suck the fuel through the carb to prime it.

If this is the case, here is the sequence: Fuel line from tank goes to the (fuel in) side of the carb. The (fuel out) side of the carb goes to the primer bulb the (suction side) The (blowing side) of the primer goes to the return to tank.


So when the primer is pumped it pulls fuel into the carb to prime it and any over priming gets returned back to the tank.

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