My 2007 Bluewater 2550 has been experiencing a problem for the last year when filling with fuel... it's trickling in and not allowing for a fast, even moderate fill.

I've checked what I can and it seems that air is easily flowing in and out of the system.

Someone just told me today that it may be that the fuel line is diameter is closing due to ethanol.

Please help if anyone has experienced this and fixed or found the cause.

Thanks for any advice in advance!