Then connect a line from the port that blows out to the return hole in the tank. Connect the return line fron the carb to the OTHER port (the one that sucks in when you let go of the primer). Press the primer and see which port on it blows out air. If you have a primer not mounted directly on the carb, you will run a line from the carb return to the primer. If you have no externally mounted primer, this goes straight to the tank. When WD40 comes out the needle, you have found the correct port. If you still aren't sure, take the metering valve cover off and blow some wd40 through the port while pressing down on the metering valve lever. It's not always easy to tell which is the inlet port, but it's usually going in close to the side of the carb with the metering valve. That line then goes to the inlet port on the carb. The line with the fuel filter always is long enough to reach the bottom of the tank no matter which way it's turned. If a person can unserstand how it works, they can figure out the routing for any of them.
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