does anyone know which fill goes to what tank, i know my tanks are in line, switch valves say left and right, which is the left and which is the right if they are in line with each other, the boat is a 99 386 sonic

Here is the thread:

http://www.offshoreonly.com/forums/s...-gas-fill.html

As for the switches, I put the port switch on "left" and the starboard side "right".

That would be correct. Forward is port tank, back is starboard tank.