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There is a vent that comes out of the bulkhead where the fuel pick up is on top of the tank. I've had to Duramaxes and they both acted similar, what I do is don't push the nozzle all the way in while filling and use the second click not full speed on the nozzle. Mine gets pretty full before shut off, maybe a gallon short. Also, different station pumps seem to feel a different speeds. Hope this helps.
 
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