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I continue to wonder how the relief port would work with the remote reservoir that Packard offered as an option.
I don't know the answer but perhaps Packard did not expect seals to fail in the few years of operation before the car was traded in so never gave it much thought. I also don't know when the remote fill became available but the first brochure I have where it is shown is 56. If it was a 55 or 56 offering it could be that with all the other problems they were fighting and with what was probably a fairly low sale of the option that detail never was totally thought out.
I don't think there is any doubt if the vacuum seal failed all the fluid in the remote reservoir would wind up in the vacuum side of the unit. Doubt much of the fluid in the master reservoir would be affected because the port opening is at or near the top of the working fluid level.
The first generation Treadlevac unit Packard used had the port opening slightly below the lid. There is no way to seal that opening so always the possibility of fluid filling the passage. On the second generation unit the port is flush with the lid and by using the gasket that causes the blocking issue it will keep fluid contained in the reservoir -- but then that defeats the purpose of the port again.
With a remote fill kit one possible solution would be to use the standard flat lid and port blocking gasket but directly over the port opening drill a small hole in the lid so any fluid that seeped thru a seal into the seal chamber could escape or outside air could enter. The gasket would keep the working fluid in the reservoir and remote fill fluid from draining out the hole or entering the port.
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