I've had mine apart 2 times for inspection in the last 3 years. Now has 350 passes in a 9.0 car without a brake. Vent is in the back. It is in the suggested location. Tube to a catch can at the rear bumper. Catch can has never leaked or been emptied. Both times the inside of the bell housing has been completely dry. It hasn't had the pump seal replaced since originally built.
Doug