99 gmc suburban\r\n-Service lite on= o2 sensor

It sounds like the fuel filter may have reached it life time and needs to be replaced. The fuel filter should be replaced every 15,000 miles if not once every year to ensure that the fuel system is running 100%. A dirty fuel filter is the #1 cause of fuel pump failure due to extra heat created to push the gas to the fuel injectors, the other cause is running the gas tank less then 1/4. It's the gas that keep the fuel pump cool and not running hot.
Start with the simple and replace the fuel filter which should be located On all C/K's of this body-type 88-98, the fuel filter is located under the driver's side door inside the frame rail near the crossmember that supports the tail of the transmission. Replace it with AC Delco part GF-626, FRAM part G3727, or other comparable brand corresponding metal bodied filter. You should use a flare-nut wrench for the line fitting and one for the filter fitting. I'm not sure of the size needed for the filter, but the line should be 5/8"
For SFI engines ('96 and later) you need to bleed off the pressure in the line. Locate the pressure test port on the fuel rail under the hood, remove the cap, press valve to relieve line pressure and recap valve. If ground clearance is not high enough to get under vehicle and work, raise it with jack and rest frame on jack stands.
Caution: Fuel in lines and filter will run out once fittings are undone. Use fuel safe container to catch fuel spill.
Take wrenches and hold filter from rotating, while loosening line fittings. Remove Filter from bracket by sliding and manipulating fuel lines for clearance, and slide filter out of bracket.
Reassembly is reverse of disassembly. Tighten fittings snugly. Reconnect battery, turn ignition on (do not start). Pump will make brief whirring sound - less than 5 seconds. Check for leaks. No leaks - good. Now you can drive again.
Hope that helps, keep me posted. Glad to know you got your truck running 100% again soon.