The in connection was very tight. I took the air filter module and entire fuel filter bracket off. I removed the out fitting to the filter. I gently pushed the filter sideways to acces the bottom (in) fitting. The factory hex head is very short, so I used small vise grips and a 14mm crescent on the fuel line hex head. Turn the vise grips counter-clockwise while holding the 14mm wrench. The replacement filter had a hex head that was 3 times taller. Also, check for burrs around the air filter mounting bracket before you reach in there. A file may save you a few cuts.