I apologize, I got the message composed and forgot to add the pic.
The fuel nipple on the carburetor that is closest to the top of the carburetor is the one that the small fuel line with the fuel filter will need to go to. The nipple below that one on the carburetor DOES go back to the primer...it will go to the "IN" side or negative pressure side of the primer.
The two nipples on the primer are marked, IN and OUT.
One nipple on the primer produces positive, or PUSH pressure"OUT", the other produces negative, or PULL pressure"IN". The fuel line on the bottom nipple on the carburetor will need to go to the negative, or PULL pressure side of the primer. The remaining fuel line goes from the positive, or PUSH side on the primer to the hole in the fuel tank on the right hand side of the saw...this is your return line.
Something to keep in mind is that this system pulls fuel through the carburetor rather than pushing it through.
There will be two ways to tell if you have the fuel lines hooked up wrong...the first is when you push the primer, the primer bulb will stick in the in position rather than popping back out...the second is when you push the primer, the primer will kick back out like its supposed to, but you'll find its gushing fuel out the throat of the carburetor.
If when you're all done, you don't get either of these symptoms, then you know you are in good shape. Please reply here should you have any further questions, or need any help.