Many many years ago, I had a significant problem with my vent line. Eventually, I had a mechanic reroute the line and everything was back to normal. But lately, a new annoyance has been created due to rerouting of my fill line. The loop on the vent line is no longer high enough and if I top off the tank, I'll get a surge out the vent line. The initial fix is not to top it off anymore.
But to get the loop higher is not easy. It is only an inch from the instrument panel and wiring is like a massive spider web. Plus, it's a tight fit. This past summer, I disconnected the vent line at the tank then reached through the access point via the cuddy and expected to pull the line several inches to raise the loop. Dam thing would not budge! Not even a millimeter! So, the next thing to do [which I didn't want to do] was remove some of the cabinet beneath the steering wheel. That didn't help either.
I tried to disconnect the line at the thru hull port and add an extension to it so as to increase the height and length of the vent line loop. But I could only get one hand on it or the tools needed to loosen the clamps [whether through the cuddy or the cabinet]. I was apprehensive on doing this, It's not really broken, didn't want to make it worse so I left it alone, put everything back together and just didn't top it off anymore.
To really get to it and really get both hands on it, I will have to remove the entire cabinet beneath the steering wheel. Not looking forward to that.
Good luck with yours.