I don't know then, and am at a loss. When this first started occurring, I pressure tested my entire fuel system and it was top notch. I also removed the tank to clean it and check for any junk in the tank (since someone suggested that at the time), and the interior of my gas tank is like chrome. There were a few random bits of debris in the bottom (looked like tiny rocks), but they didn't even float and certainly weren't big enough to block anything.

This is a horrible problem when it occurs because I have to wait a very long time before the vehicle will even start again, and it can happen after hours of driving so I can be in some pretty far away places by then. The worst was honestly on the side of a mountain at 8000 feet with no civilization for 20 miles. It was over an hour before it started again. Fuel lines remained dry all the way back to the tank.