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#40012
2fast4me
Participant

    There is a small copper line on the inside of the filler neck on my 2 zephyrs or my 3 lightfours (if memory serves) they route back through the inside of the tank to the shutoff valve and then to the carb. That is the venting system. All of my Evinrudes have that line plugged with crud.
    If you can get another cap with a vent screw you will be much happier mariner.

    2Fast4Me