The Boating Forum - Engine filter with wire to blue plug????
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10-29-2010, 06:03 AM
On my 250 EFI mercury (1997), it has a fuel filter mounted on the starboard side that has a blue screw in plug on the bottom with a wire attached to it. What does this plug do? Does it sense water or does it act as a magnet for metal particles or something else?;?
10-29-2010, 06:12 AM
I don't know Mercs but my Yamaha has a similar set up and it is the sender wire and connector for the "water in fuel" sensor. However, I am not sure that a 1997 motor would have this feature.
Maybe you better wait for knowledgeable Merc guys chime in.
10-29-2010, 06:35 AM
It is a water in fuel sensor. When you buy a replacement filter it comes with a new one.
Very simple and reliable system.
10-29-2010, 06:54 AM
Thanks guys. I just purchased the boat in August. I was checking things out on the motors and drained the filters to see if water was in them. Sure enough, about 1/4 of the volume was water. When I took the plug out to drain, the tip of the plug was flush with the blue plastic. I just put new filters on the motors and hope this solves my port engine starting problem. We shall see.