Just purchased a 99 Supra Comp w/ 400 hours.

Used it for the first time this past week. The boat seems to leak, although the rate of leakage seems to be different depending on usage of the boat.

When mooring, leaking seems to be low. Perhaps 1/2 gallon overnight.

When cruising at low speeds it seems to be worse. In one case, bilge must have pumped 5 or more gallons after a 30 minute cruise.

When running at higher speeds, leakage seems to be lower. Certainly less than at low speeds, but possibly more than when mooring.

Is this something I should have looked at? This is my first inboard boat and understand the packing nut needs to be replaced/rebuilt every so often. Could this be the culprit?

I would be grateful for any guidance y'all could offer. Thanks!