The PSS vent hose is critical and intended to keep the seal faces lubricated but allowing any entrapped air to vent out of the shaft log. By venting it into the vessel you may find the vent burps when you place the boat in reverse. The reverse thrust of the prop is in a direct line of sight with the shaft seal and can force an initial burp of water up and out of the hose. The water does not continuously squirt out, and it equalizes quickly, but an initial thrust, of reverse, can push about an 1 oz of water up the tube and into the boat.


To solve this problem I’ve added, to the existing vent hose, a couple of brass elbows and a bicycle water bottle and bottle holding bracket to catch this reverse thrust water. To make sure the system was still able to vent air I made a hole in the top of the bottle to facilitate venting and routed the vent hose into the bottle below this hole. It takes about a two-four weeks of using the boat before bottle tends to get full. Just check on it when you check the oil. If you are venting a PSS internally be aware that running the engine in reverse can and will push water back into the boat..