LD wrote:
Actually, all of the standard vents I've seen do have a screen at the
exterior portion of the vent to keep the bugs out.

Yes, I've seen that a lot too. Doesn't make it a good idea (and the ABYC
still takes a dim view).

The idea of routing the vent hose above the opening sounds good.

If you need more tankage, putting in a bladder in an unused bilge pocket
might help. Get more weight down low too. I am planning on doing that on
our boat.

Fair Skies
Doug King