RayRayGSXR

I too have the same problem, I have 2002 Yukon, and it started off... if it was left with under a 1/4 tank of gas and sat over night it wouldn't start. I noticed it progressively getting worse that if it had a little over 1/4 it wouldn't want to start, up untill 1/2 tank. But once you put gas in, it would crank right up. I replaced the fuel filter, fuel pump, spark plugs, & wires, now it even gives me trouble with a full tank. (A by the way: the mech. I took my truck to is trying to tell me that now it might not want to start due to the bosch +4 spark plugs I put it, which I think is bull....somebody back me up) so needless to say for all of us it seems to be a phantom problem. If anyone can help, I would really appriciate it.