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2001 225 Yamaha ox66 oil overflow problem

Brettnc

New member
Tearing my hair out with this one. Oil is draining out of the overflow tube from the engine oil tank into the air silencer. This seems to happen with the key off and no +12 volts to the remote tank pump. Has anyone experienced any sort of siphoning issues with the engine mounted tank?
 
It's properly filling to the line. I tested the stop switch on the sensor and it works great. This seems to happen after I trailer the boat.
 
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