Originally Posted by hpsVFR
Letting fuel fumes out is probably prohibited by emissions regs, except via a charcoal canister. That's just a guess, though.
Another option would be to run the vent line into the main tank through the fuel filler cap. Any spew would just go into the tank. Routing the vent line to the front of the tank would prevent length problems when the filler cap hinged forward to open.
Or, you could [edit:never mind, you'd just dump fuel with this idea.]
There might be problems with both suggestions, but they might also be helpful.
Not sure how I'd go about this. I want to keep that fuel cap vent open so that pressure can't build in the tank