I just bought a slightly used 1999 SeaRay 190CC. This boat looks prefect but after two outings the fuel gauge is still on full. I suspect it is not reading properly. When I turn the key off it drops to the E but when I turn it on it stays on F. The boat has a 6cyl engine but I don't think it gets that good of gas mileage. After two hours of on plane running it shouldn't be on full still should it? The only other problem I have with it is I can't get the cuddy hatch open. I moved the handles 90° but the hatch won't open. Is there another handle, latch or a lock I can't see?