wow that was confusing reading those answers.
flying freak weird way of fueling? not really, pretty common method actually.
for the NEXTAR the color code is simple, blue line is the fill.green line is the pressure line to the muffler,red line fuel to the carb.

the red line should be connected to the clunk the weighted line in the tank.

the green line should be connected to the pressure line which has a bend inside the tank directed to the top of the tank.

the blue line should be directed to the strait line into the tank for fueling.

to de-fuel your plane disconnect the red line and suck the fuel out through there only the red line will have the ability to draw the fuel out of the tank on the NEXTAR then fire up the engine to run any extra fuel out of the engine.some tanks are set up with a pipe or extra clunk on the fueling line but not the NEXTAR as it comes stock from the box.
as a side note best to check the tank to make sure yours has the fuel lines set up the right way and when you reinstall the tank that you have written down what line goes to where.so you prevent any unexpected dead sticks .