Quote Originally Posted by rtpaxton2 View Post
It keeps throwing an oxygen sensor error. They have replaced both sensors on the boat.

I'm not sure if you saw in my first post, the boat does have TWO fuel pumps. The second pump was an aftermarket add by the first owner's dealer when he was having vapor lock issues. I wonder if the second pump is boosting the fuel pressure too high. Indmar is telling my dealer not to let the boat out of their shop with the fuel pressure where it is. I have asked the dealer to bypass the non-OEM pump, and see if the pressure returns to normal.
I am familiar with the two pump system. Usually the add on pump is nothing more than a booster to clear vapor lock within the main pump. I wonder if you’ve always had high pressure at the rail. Removing that pump and testing it would be a good move just to isolate that part of the system. Should also try a different fuel pressure gauge too. Good luck, I hope you find out what’s wrong I know it can be frustrating especially when the shop runs out of ideas and starts shot gunning it.


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