I can't say that I've ever allowed the trucks fuel to run low enough to suck air. One of the things about this truck that I don't like is how much the fuel gauge moves around while driving the truck. The lowest that I have ever had the tank is just below the 1/4 line. When I stopped and put fuel in it held 62 gallons. I didn't have any problems that day but I was starting to sweat things a bit because the gauge was bouncing off empty.
We just got some snow here yesterday so give me a couple days for things to melt off and stop dripping and I'll crawl underneath and check out the straps and hardware. Don