I bought a 25' sailfish 1990 last week. I took it out for the first time this weekend with the family and had a great time. We went to Plymouth harbor and visited the Mayflower. Now, I assumed I was cruising on the main fuel tank, but apparently was on my aux. tank. So I soon realized that I had no idea how to switch to my main tank. The owners manuel was no help, so here I am, asking the pros. Now I know how irresponsible it was of me to go baoating without complete knowledge of my vessel. i needsome advise. Thanks for any responces. New Grady owner. Splash