For owners of larger Grady's with diesel generators what additives if any are you guys using in the diesel fuel. I have a FP 4200 on my boat. When I bought the boat the previous owner provided me with an additive, which I have since used up. Just looking to get a recommendation on what I should be if any be adding to the fuel. I typically fill the tank with 5 gallon cans with clear diesel from the gas station. I'm in the north east and the boat sits on the hard from Thanksgiving to mid April.