My 2001 Silverado with 113,000 mi has the same problem. I was told that with the fuel formula change in last few years it has affected vehicles 2002 or 2003 and older because it has corroded the metal that the float moves on. Mine will at times start working when it's 3/4 or less gas in the tank. My solution is to reset the trip od at every fill up. I get approx 450 mi on a tank but refill at 400 to be on the safe side.
This answer I got makes sense to me, but who knows.
Ok sounds like two problems, 1) bad fuel level sensor , 2)whens last time u changed fuel filter? if recient then check fuel pressure
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