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it depends where the tnak is, the vent shoudl be near the tank, just like the pump out fitting. so start looking for a vent fitting aroudn the area of the pump out.
Some boats have charcoal filters on the vent line to remove odors. they need to be replaced every couple of years. If they get wet (overflow) they clog right away. in doubt, trace the vent line from the holding tank.
could be another issue besides clogged vent line... like a broken dip tube in the tank if that's how it's set up. also, make sure you dont' have a valve on the discahrge line, some boats do....
if you suspect a vent issue, try this. close the pump out cap tight... flush the head a couple of times and SLOWLY open the cap. if you feel pressure, STOP! let it escape slowly, that means you do have a clogged vent
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