The US Coast Guard issued a safety alert recommending that fuel oil quick-closing valves (QCVs) be inspected. Recent inspections by USCG boarding officers have revealed QCVs that have been intentionally blocked, modified, and/or poorly maintained. QCVs serve to isolate fuel tanks in the event of fire and are operated from a remote location. Engineers and other stakeholders should examine the QCVs to ensure that they are operational.