Bulb on my 1967 Johnson 6 doesn't get hard. When pumping sounds like air is getting into line with gas. Engine will run for about 5 min then stop (fuel starve?). I noticed gas leaking at connection between line and gas tank (6 gallon metal tank) when pumping bulb. I bought new fuel line, bulb and connectors but the leak at the line/tank interface persists with pumping bulb. Can the male adaptor on the gas tank go bad? The male adaptor is part of the gas level indicator and can't be separately removed. The newer tanks have a threaded port to put in new male connectors on the tank. Any advise appreciated. I hope I don't have to buy a new tank. I'm sentimental towards the old metal tank.