I have a 2000 150 h.p. Johnson and I am looking to replace the gas line connected in the engine-unlike most outboards I have owned this connection is not located in the front with simple and easy access.The gas line goes into the engine itself with very poor visibility access.Do I need to take off the bottom cowling and what type of gas connection is it?I dont want to start pulling things apart until I know what is involved.Thank you Andy