I left Shaw Canal planing to run down to Gulf Harbour Marina to fuel up and then take esCape back to Walker Marine Group in Cape Coral for summer storage. Shortly after I got up onto plane out in the river, I noticed an unsual smell, came off of plane and open the engine cover. I could immediately see that the plastic plug in the fuel pump/cooler module had failed and the engine was pumping seawater into the bilge. I had had one of these plugs fail several years ago after the water pump was rebuilt so I had extra plugs on board. I was unable to remove the remants of the old plug and later discovered that the plug had apparently been JB Welded into place 2 months earlier when the water pump was again replaced. Left with no other options, I called SeaTow for my first ever tow back to the dock.