Well for some time ive been having some issues with my yukon not wanting to start when it gets around 1/4-1/3 tank of gas. I know it does have a 31 gal tank and if i were to park at weird angles that that would explain it a little better but it doesnt always do it. Is it possible that my fuel filter could be getting cloged since its the original with 86k on it or maybe junk in the tank cloging the pickup screen? Its very aggervating issue lately. It did it the other week and had about 1/3 of a tank left and wouldnt start i ended up drifting it backwards a few feet and then it started when i tried.