In the past, when camping with a dodge friend, we used to open his water drain and fill a cup with fuel to get a campfire started. This trip, I tried my truck. I opened the fuel thumb screw on the bottom of the filter and nothing came out. As a matter of fact, I completely pulled the screw out and nothing came out. I drove the truck that day a couple hours ago. Is this normal? I think not, but could be wrong.