Sometimes the problem is caused by a plugged vent or a sag in the filler tube that goes from the inlet to the tank.
Many times, however, the newer nozzles that are designed to cut down on the escape of fuel vapors are frequently causing problems. For me, older pumps and nozzles rarely click off prematurely. The new nozzles don't cause problems for cars, but they do on motorhomes because the run from the filler inlet to the tank is much longer creating more back pressure.
I found in some cases it helps to push the nozzle farther into the filler neck because there is less splashing of the fuel. In other cases, pulling the nozzle out as far as possible is better because it allows some of the back pressure to escape. It all depends on the pump, nozzle, how level the coach is and even on ambient temperature. If none of my tricks work, I have to baby the flow manually.
2015 DRV Tradition 375KPS
2015 Chevy Duramax 3500HD LTZ Dually
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