Fueling

My mom own's a montana minivan she bought new. The van has been giving her issues when you go to fill it. She had the van serivised at a dealership years ago and thay ended up replacing the entier fuel tank. Since then the van has had a problem when you go to fill it, let me explane. You insert the fuel pump into the fuel fill and go to fuel it and the pump puts a lttle gas in the van maybe a few seconds worth and STOPS! Now this will go on for the entier time your filling the van. If you squezz the pump handle gust a little. So it gos in real slow. It will fill the fuel tank. The van has always been well maintained since it was new and this problem with filling the van has gone on all over the u.S.A. At all the gas stations that you fill it at. We live in mcdonough georiga, and the van is out of warrenty now. She's gona give the van to me case it runs so good, and im pritty handy with cars. Grew up in the R.V. Bissness and would like to fix it myself. My girlfriend is embaressed to fill it and im catching hell for this problem. It doesent leek fuel and I really like driving it. I am just tired of looking like a fool at the gas pump. Please help! Thanks.