One week's holding capacity...
Hello 63Sfri (Keith),
Wow, that’s a good question.
I looked through the A/S web documentation right up to ’73 and this is what is mentioned:
- 30-45 gallon pressurized water tank (fresh water); and
- Septic tank, originally fiberglass and then changed to polyethylene, with approximately one week’s holding capacity.
You will just have to use the old tried and true method, as RickDavis mentioned, and measure by filling it with known amounts of water until full.
Good luck and please respond with your findings,