when I fill the gas ,it is very slow to fill. on 2002 Hyundai Santa Fe

When I press the lever of fill nozzle it pops out and filling stops.I have to press the lever very little only then gas goes in the tank but very slow.
It takes about 20 minutes to fill the tank.
please give your comment, thanks

Asked by for the 2002 Hyundai Santa Fe
ck filler neck vent hose for kinks or blockage