Yes it can easily be fixed. Whats leaking is the fuel heater electrical element fitting. you can open it and replace the o ring but it will continue to leak another time later on. Or you can remove the fitting. Tap the hole to 1/2 inch national pipe threads and install a pip plug.No matter where you live the heater is not effective. It might have been a good idea if the heating element was on the bottom of the filter but trying to heat something from the top never really works. Think of a pot of water on the stove. the heat is under the pot. Not on top of it... Also there is plenty of information with pictures how to repair or modify this bad engineering problem...+9i