Reply To: 1957 Evinrude 18 HP Fastwin

[Don]

I am confused.  Are you using the original pressure tank, or has it been converted to single line/fuel pump?   You speak of pumping up the “bulb” which would indicate the single line system, but I see the double line connections.  In any event, there is an issue if you must pump the primer bulb/button continuously.  That manifold pressure line looks oversize and leaking at the connection.  You should not need one of those worm clamps if the line connection is a good fit.  Keep in mind that a poor pressure line connection or leak will also cause the engine to idle lean…