Try turning the nozzle to either side. Don't hold it at the 6 o'clock but rather at 4 or 8 o'clock.
I say this because this will change the position of the backfeed on the nozzle and may work better.
If hat has no effect i would look for a crimp in the truck fill tube or something blocking the truck vent line coming up from the tank.
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WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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