i was just wondering how to get to the fuel filter...which bolt do i need to take off? and do i need to put some diesel on the filter b4 i put it on?

Which truck in your sig are you working on?

If it's the 98.5...

Remove electric connection on housing first.

Loosen the 3/4" nut on the top center of the filter housing, hold the bottom while doings so.

Yes, it's a good idea to fill it before putting it back on.