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There is a fuel fill cutoff sensor on most vehicles. Looking up F550 chassis you most likely have one. I had to 2 vehicles that needed replacement that were not your type with the same issue as very slow fill. One car a 2011 VW had to replace the fuel tank because the sensor was integral to the tank and the other was a switch. The other was a Ford Focus;its been a while I think they replaced the filler neck. One other probable issue is a kinked or blocked vent/ vapor line.
The last place to go is your friendly Ford dealer and hope it won't hurt the wallet too much.
Good luck
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Rob Anderson
Manassas VA
2015 Thor Hurricane 31S
2015 Jeep Wrangler Willy
Blue Ox Tow Bar and attachment Plate/SMI Brake System
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