Oh how I hate what is called the ORVR system. This is not something we can really test. I sometimes take the car to the gas station with this concern but who's to say the gas station we use has the same nozzles. ORVR stands for Onboard Refueling Vapor Recovery system, ideally it should contain the Hydrocarbon rich vapors displaced while refilling the gas tank it cleans the fumes while letting the air out through the charcoal canister. This system requires the pump to work correctly as well as the car, I know what you are thinking great another variable.
The pressures this system works with are so small it is near impossible for testing to be done accurately. Since the pressures are so small any issue anywhere will cause the pump to shut off (the pump works on the same negative pressures)
The pump is similar here is an excerpt from http://auto.howstuffworks.com/fuel-effi ... l-tank.htm
Near the tip of the nozzle is a small hole, and a small pipe leads back from the hole into the handle. Suction is applied to this pipe using a venturi. When the tank is not full, air is being drawn through the hole by the vacuum, and the air flows easily. When gasoline in the tank rises high enough to block the hole, a mechanical linkage in the handle senses the change in suction and flips the nozzle off.
Really the only thing you (the owners) can do is make sure the little rubber boot on the nozzle is on there nice and tight. Keep it as still as possible, unless your state allows you to lock them
make sure the receptacle end on the car is clean.
If there is a problem with this system there are only two things that can be replaced, one being the filler neck, the other being the gas tank. There have been some updated shutter valves announced via tsb over the years but those are only free under warranty (tsb not recall), the parts are really cheap but finding someone willing to put their hands inside your gas tank will usually cost you. I have needed stitches after cutting myself on a gas tank.
If you decide to do this yourself use extreme caution.
I have had a few issues like these over the years but they are fairly few and far between not to take away from any of your individual concerns but you might have to return a few times before this is resolved. Not only do most of the people in the dealerships not actually know what the ORVR system is diagnosis for this is a real pita, and there is no verification process.
The only time we (the technicians) know we did our job if you (the owners) don't come back mad at us.