My 1977 Morgan OI has an approximately 130 gal. aluminum tank built
behind a bulkhead on the port side passageway from the main saloon to
the aft cabin.

When I could not get pressure I assumed the tank had a leak and tore
out the bulkhead exposing the outside of the tank (the other side of
the tank is curved and is seated in sprayed foam against the hull).
Outwardly the tank appears like new but I realize that it could be
completely rotted within.

Problem is I find no dampness anywhere around the tank and am now
beginning to suspect that the tank is sound.

Does anyone in this group know of a way of testing the tank, i.e.,
using compressed air to pressurize the tank and leaving a gauge on it
for 24 hours or so to determine if there really is a leak.

Any ideas on testing this tank without removing it would be greatly
appreciated.

Thanks,

Joe