Fuel filter o-ring?

[jms02050]

Changed out the fuel filter on my Yanmar 6LP. Fired up the engine and all was well... until I looked in the empty fuel filter box and noticed an o-ring. I assume it goes on the filter, between the filter and the water sensor that threads onto the bottom. But I definitely don't recall seeing an o ring when I took the sensor off. It's possible that it had been left off in the past.

The question is... do I need that o ring on the bottom of the filter? It's not leaking and the engine is running well. Hoping it's a throw in for different engine set ups.

Thx.

[Carl]

If you go to the document Library and look this up in the manual, you will see that the O ring goes onto the sensor that screws up into the new filter. Chances are, your old O ring remained on the sensor when you put it back on. Next time you change it, you now know to look for it, and replace it.