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If it is not the marina nozzle (which it could very well be) I know what it is.....
The fill hose to the tank is not sloped enough. There is an effective "flat spot" in the line where the fuel can "pool" inside the line because it can not drain fast enough. you need more pitch (slope) in the line. When this happens you get a temporary air lock in the line and it the fuel backs up in the line until it burps itself and the cycle starts over.
This most likely happens in the water and not on the trailer because the boat is at a different trim angle. Once the boat trims bow up slightly you will find it fuels up better because the flat spot in the line is now sloped somewhat.
Cheap fixes are:
1) have your passangers stand in the stern.
2) Don't let your tank get real low
3) re-arrange your fuel slightly line for better pitch
4) refuel on a trailer
5) fill your live wells(if you have large wells) before fueling (to get the bow up)
good luck
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