X-type petrol extremely slow fuel fill

Hi All - I have a problem when stopping for petrol. It takes about 20 minutes to get 40 litres of fuel into the tank.
Please be something simple… Any help greatly appreciated. Thanks

There are very cheap bore scopes that can be purchased nowadays that connect to phones, I would be looking at the fill pipe to see if there is an obstruction there in the first instance. Should be a lot quicker than that.

I had this problem. Anti-theft trap door had detatched (failed spot welds) and fallen down the tube side on. I replaced the filler tube. Russ