Ok so I have found some posts on here that explain exactly what I am experiencing under low rpm my boat runs fine but when I get above 3300 Rome it seems like the boat is running out of fuel. One post on here said that he cleaned the anti siphon valve can any one post a pic of what they look like or maybe tell me where it might be located. I have a 1980 3.7 mercruser any more suggestions would be great
