Well, Im just having issues filling the truck up at the pumps. When I put the pump on the highest notch, the pump runs for a second and then it comes flyin up out of the filler neck and shuts the pump off. I usually have a good cup or two of diesel down the side of the truck. I have a RDS 90gal tank plumbed into the vent hose and the fuel vent mod. Any ideas whats going on?? The pump says its only pumping 7gal/min which is pretty quick but its no big rig pump.