Hello. Just changed out the fuel water separator on a 23' powercat I bought, and noticed that the element in the filter had corroded in to a sludge. Thinking I should change the fuel filter too, but I need some info first. <br />Do I need to replace the entire filter or can I just replace the inner filter?<br /> Is the fuel filter the ~3" long yellow cylinder on my fuel line just inside the motor cowling? <br />Thanks.