The fuel filter is inside of the tank. Check all of the lines inside to see if one of the hoses came off. Do a search on this topic because there has been a few posts regarding it before.
Filter & pump are easy to get out once you get the filler assembly off. Remove the allen bolts on the top of the filler cap. Then make sure you remove the tiny allen screws around the inside edges of the filler cap. Once that is done, it is ready to pop off and gives you access to undo the hoses inside and remove the filter & pump assembly. This is an easy task that should be done in 45 minutes start to finish.
Even if it isn't the problem you could use a new filter if you have never replaced it before.