I have a 2000 Johnson 50hp. Runs fine when it first comes off the trailer and go. After I stop to fish about 30-45 minutes and restart, it will take off then sputter and spit then die like it's out of gas. Before I restart I pump the bulb( which is empty ) and go again. Once the engine is hot it will run great until I stop to fish again and it cools off. Could this be the fuel pump(vro)?