If your 410r uses the primer bulb that is separate from the carb (the older 3-line setup), and the carb is a Zama, then the 3 fuel lines should be routed as follows:
1) The main fuel line that connects to the filter inside the fuel tank, goes to the bottom of the carburetor (or the elbow shaped nipple).
2) The fuel intake line runs from the top of the carburetor (straight nipple) and goes to the short post on the back of the primer bulb.
3) The return line comes from the long post on the back of the primer bulb and goes into the bottom of the fuel tank.
The original colors were clear for (1) and (2), and blue for (3).
Bladeslinger
April 2009