The fuel pump may fail causing the engine to stall and not restart.Google+
Car Problem Reports
Chevrolet Avalanche 1500 "No start" Caused By Failed Fuel Pump
Chevrolet Avalanche 1500 Problem
Average Mileage: 121,500 mi (22,000 mi - 204,000 mi)
The engine was hard to start (it did not reach the no start situation). After a repair shop kept the truck for 4 days they diagnosed a bad fuel pump. The repair cost for the new fuel pump plus installation was about $1,200.00, which I thought was outrageous. Will not use that repair shop again.
Visitor, 2005 Chevrolet Avalanche 1500, 75,000 mi
Truck won't start on first try esp if the ac is on. Turn the ac off wait a few seconds then it will start right up.