I wonder if anyone out there can solve this one. 2010 F-150 XLT Crew. 4.6L V8 4X4 86,000 km. When I refuel , whether its 20 bucks worth or a full tank, the truck will not start normally. I release the key from the start position to ignition on position and the starter stays engaged until I switch it off but no start. I can start the vehicle only by flooring it while cranking and I have to goose the gas pedal for about 10 seconds to keep it from quitting. I have to keep the rpms up for about 30 seconds once it starts. After I ease the rpms down to a normal idle, the problem disappears until I refuel. My tech has scanned it and has air blown out a plugged line. Didn't work. Anyone?