Tried to fill sons car with gas, only able to put approx 2 gallons in then came out. NOticed that gas was in filler tube. Took home and disconnected all fuel lines and then noticed gas in fuel shut off hose. put a wire down there and no blockage noted, tried blowing gas down tube with compressor, then gas coming out of fuel tank vent and higher in fuel shut off hose. . Stumped on what to do next. We did just get this car a bit ago

 

Anyone.... After reading some more on this, maybe fuel charcoal vapor container?

thoughts please

 

Any idea about the service history of the vehicle?

I assume you've checked every hose for blockages?