How important is the fuel bowl heater? I had my #30 fuse blow 1 week ago, so i unplugged the heating element and replaced the fuse. The truck had been getting harder to start lately, and today no start at all. I think its the glow plug relay, because I was getting no power across it when the key is on. I took jumper cables and went from battery to the other side of the relay and was able to start the truck. I am fairly certain the relay is toast, and have a replacement ordered from Corey. So does the fuel bowl heater really that necessary? Oh and I have changed glow plugs with motorcaft ones about 65,000 miles ago.