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Since the Uplanders have the long (front to back) skinny gas tank, with the outlet to the rear; if you run out of gas with the front/nose inclined lower than the rear, then it can take upwards of 5 to 8 gallons to get it started again. It was written up in a GM TSB. Two gallons won't start it. When the gage reads less than 1/2, it's not a good idea to park with the front lower than the rear...unless you carry a full 5 gal. refill. Thank you GM engineering.
Sounds like fuel pump burned out when you ran out of gas. probably ran dry for about 20 sec till engine quit. Check for power to fuel pump in tank.Most likely fuel pump will need replacement . Hope this helps
Good chance that even on 4 gallons it may not start I would try for more, prime the fuel pump several times by turning the key on and leaving it on for around 5 seconds then shutting it off and repeating, obviously not trying to start. I've had cases where even small FWD cars won't start even on 4 gallons on a 12 gallon tank. The newer fuel pumps are a closed system that only allow a small portion of fuel into the pump housing to keep contamination down. Let me know if after adding a few more gallons it won't start we will trouble shoot from there. Thank you for using fixya.com