No need for a vented loop on those but it's probably worth putting in just
to reduce the back flow and amount of water in the bilge.

While you're at it perhaps we should revisit my current thinking on bilge
pumps ad currently done on "Strider".

The Rule, et. a., pumps often have a short life sitting in the bilge water.
Most of the water they pump is in very small amounts. The hose sized for
the pump to save your boat is large enough to cause a lot of backflow and
water in the bilge with a transom discharge. The answer to both problems is
two pumps. The first, in your current location, would be a small pump with
a 1/2 or 5/8 hose. This will easily deal with condensation, stuffing box
drips, etc. It will also make less noise and draw less current. The
second pump would be located high enough above the bilge that it will always
be dry, it can have a simple float switch because, if it is ever needed, it
will probably go on and stay on until the battery runs down. This pump
would be the largest appropriate for the hose diameter.

You could put a Tee a couple feet downstream of the vented loop and run the
small pump into that. If only the big pump was running, some water would
divert back into the bilge but, mose likely, the litte pump would already be
working against a leak that was simply faster than it could keep up with.

The ideal thing would be a second line for the primary (small) pump. I
would run this out the counter bottom just ahead of the transom.

--
Roger Long