I have a mercury 50hp 1982. When the key is left on but not running black lava leaks out of the choke solenoid. When it cools it turns to a rubber like puddle that I can pick up and throw away. What is leaking and does that mean I need a new solenoid? The plungers plastic connector broke so im going to replace it. Closest boat srore is 20 miles away and have already been 3 times in the last week for other projects.