I have an 1998 Evinrude Vindicator 225. My question is how often should I replace the fuel lines from the tank to the outboard and how often if ever should I replace the fuel lines on the powerhead? I was told the ethanol eats away the inside of the hoses and should be replaced every 4 years or so. The manifold lines are almost impossible to find and the fuel pump to carb lines are $$$. Needless to say the lines are preformed....geez Thanks in advance.