The reason im doing this is because I have just placed my first load of B100 in and changed the fuel filters approximately 200 miles ago when performance dropped significantly. After the change, everything was fine but now I'm "mis-firing" at idle (sounds like im running on 4 cylinders). I looked at the secondary fuel filter to find that it is almost empty at idle and when reving the engine, it will fill with fuel. I assume that it cant get fuel from the tank. I dont want to fill the tank and reverse the lines since its almost empty and a perfect time to check the screen. If i reversed the lines know, it probably wouldnt run due to where the return line comes into the tank.

Does anybody know what size hex will fit that plug? The screen is attached to the nut somehow?

Thanks for all the help.