Saying this not knowing if you have changed it before.. If you do change it make sure what kind of filter you have in it already. As in the some filters come with the bowl lid and filter as 1 piece, so if whoever had the truck before you changed this out to one of them and you don't have the factory cover and you buy just the element its not going to do you any good. The truck i got just last month had a purolator filter in it. So i got the same filter again since i do not have the factory fuel bowl lid.

On the filter change issue. I have heard anywhere from every other oil change to whenever it feels sluggish and needs it. I'll probably go with every other oil change or 1 time a year since I usually won't put more than 10k miles a yr on my truck.