Start up and if you want to evacuate the air from your bilge at any point. Just do a search for marine fuMe detectors-xintex basically makes all of them. It is a simple sensor that runs to a dash mounted alarm, much like a high water alarm. It would sense an increase in dangerous gasoline vapor long before you would if you encountered any kind of leak. Some might think it is overkill, but if you were worried about decreased venting it may give you some peace of mind. They y have arelay in them that will start your blower automatically if the vapor level reaches a certain percentage.
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