Is the raw water seacock open? Is your impeller ok? I would check these two ASAP. If this is a new to you boat, and it is the first time in the water this season, the seacock may be closed and/or the impeller removed for winterization. ALso, before you open that seacock, make sure it's hose is clamped on securely.
Catalina 38, Hull #112
Grosse Ile, Michigan