We recomend changing filters every 5,000 -10,000 miles!
Some say more, Some say less! It's really depending on where you purchase your fuel, Some stations begin to accumulate more water or sediment in the tanks after a few years. Now, Dont get scared they are required to filter the fuel before it goes to the nozzle! I belive the regulations state somthing to the effect of 15 Micron (someone correct me if im wrong) so your fuel filter will catch some of what the stations filters will.
Now theres some variables involved , considering probably 50%or better of your contaminates and trash comes from you and your truck!
A couple quick tips that can help,
1: Always wipe around your fuel cap, keep trash and leaves out!
2: DO NOT RUN OFF ROAD FUEL...Besides the fact its illegal for on road use it's much more contaminated due to less stringent filtering from one end to the other..PERIOD!
3: Fuel up at bigger fuel stops, Not the little mom and pops stores if possible!
4: Take the time to take your water seperator off drain it and clean it with some brake cleaner or heavy duty solvent based cleaner, Maybe let it soak with some gas in it , Shake it up and drain it! (OFF the truck of course) Now I'm not saying do this every 4 days, But frequently as in when your bored and have nothing else to do! Cleaning it to much wont hurt anything, Just protect you from buying more fuel filters.
The water seperator is not designed to collect particals, BUT as grime and grit passes it will adhere to the surfaces, Eventually fall and decrease filter life!
5:Watch your fuel pressure, Its the easiest way to see your filter life , Watch for gradual and split second changes!
6:Run fuel treatment! Fuel treatment , In short (this is not a scientific description, Lets not make this a your wrong scientific explanations, This is the simplist and easiest way to explain fuel treatment to a every day joe, Although this isnt exactly how the process works)
The Fuel treatment collects water , and some small sediment, and breaks down other parts of your fuel and makes it more managable! The key is, If the fuel is in good condition, It's much easier to maintain your fuel system!
Hope this helps some, If you need filters, Give me a call! We keep some in stock , and can drop ship as well!
Thanks
L