RedactedNarrative: V1 was engaged in recreational cruising in a rental vessel and was returning to Cape Coral from Sanibel.  V1 was taking on water during the journey due to a thru-hull fitting hose failure and did not discharge the water collected in the bilge because of an improperly mounted bilge pump. 
  
  V1 had an engine failure on the return trip to Cape Coral and the operator anchored V1 as instructed by a rental company employee.  V1 became swamped in the anchored position, which resulted in V1 capsizing and sinking.  The occupants entered the water as the vessel capsized and were recovered safely with two of the occupants receiving injuries requiring medical attention.; One peron suffered a contusion to the Left Ankle; Another person suffered a Corneal abrasion to the Left Eye.