Yes the Tanaka has fuel flow from the tank to the carby and then to the primer then back to tank ,the longer pipe on the back of the primer is the one that goes back to the fuel tank.
My primer works but when I disconnected the fuel hose that goes to the carby from the primer the primer was pumping fuel the wrong way.
I prefer to change these primers for new ones as old ones don't work as well and it generally doesn't take long for the clear bubble to split on old primers.
