The GMT900 platform doesn't really have a history of fuel pump failures.
This is sound, no questions asked. ^^^
I own a previous GMT-800 gen truck. When she rolled over 175k, I did replace the fuel sending module entirely as cheap insurance after I found her down on fuel pressure by a few pounds.
But rather than drain a full tank and try to manage where 27+ gallons of gas were to go?
I reached up under the driver's side rear bumper and disconnected the body-tail lamp and trailer harness plugs. I loosened up the passenger side bed bolts to within 4 turns of falling out. I removed all 4 bolts on on the bed on the driver's side.
Remove the tailgate to lighten your load. I trimmed a 2x4 just short enough to tuck in on the rear wheel well that was just enough to wedge under the beds fender well and frame rail when you grab the side of the bed and lift it up.
This gives you complete top- down access to the lock ring on the tank, the cannister vent valve and the canister itself while having a fully hot and heavy tank of gas in place. Easy fuel sender, strainer sock, and level gage access. Replacement pump in my situation had upgraded wire harness, so there was a bit of chop, paste and crimp involved with marine splices that shrink and cement themselves with a very careful use of a heat gun.
Not going to lie, despite the bed tilt and prop, it's still a real tight squeeze. But it beats the tail off the Llama and can be done with truck flat on the ground without lifts and jacks or having to pump and store fuel.
Finish the job with replacing any external fuel filters (if equipped) and a new pressure regulator on the rail in engine bay.
If it's a returnless fuel system (just the one pipe into the fuel rail w/o return to the tank) there is no inline filter to change. The magic is entirely in the fuel sending unit. AFAIK.
As others stated, can't really worry about it until it fails. And when it does?
...
It will do so after you just filed it up. ;>