Fuel filter replacement

it is not difficult to do.
first thing you need to do is turn the truck off for 30 seconds, this will stop your fuel pump from pumping.
Next you need to unhook the negative battery cable to make sure it doesn't try to pump air through the lines (not needed but I wouldn't risk leaving it plugged in)
Then go under the truck (you may want a drain pan to catch the fuel from the filters) I believe its a 1 1/4" socket. remove both filters, once they are unscrewed, you will have to pull down with a little force to get past the seals.
replace with the new filters and tighten to roughly 15 ft/lbs\
reconnect the battery and turn the key to accessory mode. let the pump remove air from the lines for roughly 20 seconds.
crank the truck, check for leaks and you should be good to go.

just did the filter change on mine and didn't see any of these specifics in my manual, just how I did mine

I agree with Pergrem. On my 2004 Silverado 2500HD Duramax, I replaced the fuel filter every other oil change, so 10,000-14,000 miles. I don't know where the location is on the Colorado/ Canyon, if it's easy to change, but on the 2004 it was very easy. They may have updated the fuel filters on these trucks to last longer, I dunno. I still have my stock one and the % life is around....50-60 I think. We have I believe 14,000 miles on the truck.

If it's easy, I might replace it around 20,000. The reason on the 2001 to 2005 6.6 Duramax engines (and it's good practice on any Duramax, or diesel, in general) that you changed them rather often was that the injectors on those trucks would clog up fairly easily, or go bad. Get crud in the tips/ jets and then they didn't operate correctly and made the truck run like....poop.....they are very small holes to squirt fuel through, so you wanted to make sure they stayed clean, and so changing fuel filters often helped that.

CAT made a fuel filter adapter, so you could get the big CAT filter and put it on those engines. It was a finer mesh, so you got more protection, and it had great flow through, and was dirt cheap, like $10-20 a filter I believe, vs. $40-50 for say a WIX or ACDELCO filter. I wish they made one for our engine, but I don't believe they do.

Anyways, you should probably change your fuel filters often in the trucks, if they're easy to replace and cheap enough to buy, to ensure long engine life. It should most definitely last you more than 1,000 miles, unless you got real nasty diesel fuel somewhere. Or just a bad sensor.

I may have a more sinister reason why the indicator was down to 0 % so quickly. I changed the fuel filters and have monitored their life and so far it has not dropped below 99 % in 2 fuel fill-ups. Either I got a batch of bad diesel fuel, always a possibility, or the dealership did not change the original filters and just reset the monitor and charged me for it. I usually do not think like this, but what the truck was originally in there for was also not fixed and I went around with this dealership about that. I did not get a warm fuzzy that they cared about me or my truck. Hopefully I will have to wait a long time before it reaches 0 % again, but when it does, I will attempt just a reset and see how long it takes for the monitor to reach 0 %. My guess it will be similar to what I just experienced.