I think your vent line is to small. May have trouble filling fast Will think its full but it wont be imo.
If your not racing no biggie
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The entire vent line is too small. 3/8 or even 1/2" line won't take a dump can or even a gas station pump at full speed. I modified my fill plate to accept a 1" ID hose. Now I can fill as fast as I can.