I have a 87 Champion 201 with a 99 Mercury 200EFFI. Since I have everything out my my back compartment since I was changing my pumps & fitting. I decided to change some fuel lines. On my boat both tanks go to a electric selector switch and then to a electric pump, and then to the outboard. I told the local boat shop what I was doing and they sold me some gray Mercury fuel line. I'm a little confuse on what type of hose to use and where I can use it at. I also have read a bunch of negative reviews on the gray fuel line. I want to replace all the fuel lines, because of there age, and I have the access to them now. Any suggestion or comments will be appreciated