That's what I thought you meant. Unfortunately, I don't have an answer for you, other than this; when I first bought my truck in '96, I found it almost impossible to get the forward tank to take any fuel. No matter how I held the pump handle, it kept shutting off. After a few months of this, I stopped to get gas at a different station, and the front tank took the gas. It wasn't flawless, but I was able to fill it up. Since then, I've discovered that there are gas stations around here whos pump handles just seem to be more sensitive. To this day, I still have that problem at some gas stations, but only with the forward tank.
I'm not saying this is your problem, and I am very curious to see what fixes it for you, but this may be something to consider if you recently started going to a different gas station.