Drain the fuel into a 2 litre water bottle( I use a Dassini bottle) then pour it back into fuel tank. unplug "water in fuel" connector then use a filter wrench with swivel handle, loosen it up until you can turn by hand. Move it toward and up front of engine until you find a hole big enough it will fit through. Find the O-ring usually it is at the top of the stud. Take off the water in fuel sensor, put it on the new filter (make sure you use the new o-ring for it. Put the new ring for the filter on the stud and twist to the top. Put filter back on. Hand tighten it. With the filter wrench give it three small turns (if you tighten it to much it is a pain to get off if you don't tighten it enough it will vibrate loose. I found the three small turns will keep it tight. My Mechnaics's mechanics love to tighten it too much, so much I bent an old filter wrench and had to go out and buy one with a swivel handle so I could get both hands on it and pull from under neath the master cylinder). Unloosen the supply line banjo bolt push primer button until you see no bubbles, tighten it back up. Prime until you hear the over-flow valve squeaking. Crank with your foot on the go peddle. It should start.