The line with the filter on the end, yes? Is it possible to connect a larger line to that fitting?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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How on earth do you have a 1" hose attached to a little fill plate? Photo?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.