Gasoline filler problem

[GuyS1]

I’ve had my 2001 Subaru Forester for 15 years. Oddly in the last few months whenever I try to put gas in the tank, the gas station filler nozzle clicks off even when the tank is empty. In fact unless I very very slowly put gas in it, the filler nozzle clicks off as if the tank is full. This is a new development. Can anyone explain this odd behavior? Has this happened to you?

 

[Dick Foster]

Could be a blocked vent tube creating backpressure which the pump nozzle intrepets as a full tank. It's a small tube leading down beside the fill hose sometimes going to a charcoal canaster which collects fumes that are then burned in the engine.

 

[GuyS1]

I’ll check that out Dick thanks.