How do you disconect the fuel filter on 1993 ford 250 van?

You Need A Special Tool For This. To Replace The Filter Take It To A Shop The tool can be bought for $10 Yes ,the new fuel and A/C lines use a snap in compresion fitting. There are sets in both metric and standard, or you can just buy the size you need ,if you know it. Your gonna need to relieve the fuel pressure(a valve like on a tire on fuel rail) .Then insert the tool press in, wiggle, push in more then pull. Sometimes it can be a pain to get them apart, you just have to play with it.