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It's back low block pressure alarm again to day on the way in .Boat ran great all day and then BEEEEP low block pressure. Has to be the sensor,,,Thoughts anyone is a damn shame boat has less than 50 hours.

Void

What did you find? No voiding your own post. Lol

Big Block Power wrote: Sun May 26, 2019 9:10 am What did you find? No voiding your own post. Lol

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Yes that’s a first.

Haven't found the problem for sure still think it might be a bad sensor.Waiting on a new one. Voided because I sent the same post twice...Sorry Guys.

dogwspts wrote: Sun May 26, 2019 11:18 am Haven't found the problem for sure still think it might be a bad sensor.Waiting on a new one. Voided because I sent the same post twice...Sorry Guys.

Your still in warranty right? Or too big of a hassle to get it to the dealer.

Hassle to dealer . Hope its just a sensor.

Wouldn't expect a new boat to act like this.

Did ok after changing sensor..Not sure what the normal block pressure should be on the Smart Gauge

Let's hope that's it.

I hate to beat a dead horse this thing is crazy. I tried new sensor today ran great temp never above 150 .Block pressure 10 to 18 above 3500. After about 2 hours got alarm low block pressure showing about 5 psi on gauge went into limp mode . Happen a few more times at rpm Then ok block pressure never above 8 psi temp never above 150 . It’s racking my brain . 3 hours from any dealers.
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Well if your threshold is dropping after warm and going into guardian mode you may need to take it to a dealer.
They can scan it for true block water pressure to determine if it’s a communications fault incurring once your electrical is warm.
I wouldn’t think an impeller would give up and come back when cooler?!? Unless there’s some strange cavitation happening. Sounds like communication issues.
Make an appointment! It’s worth it

Call mercury customer service. They are great help. Sounds like dealer time. Does this happen on muffs? I had these issues caused by my fuel system last year. Doubt you have cool fuel module though which was my culpret

One more try No alarm to day but 2017 Mercruser 4.5. Bravo3 Getting a low block pressure alarm at high rpms. Dosent happen all the time. Changed to new sensor from Merc and it still happen. %0 hours on motor . Seems to mostly happen after engine is run for a while. I see readings as high at 20 and the they drop as the day goes on...

dogwspts wrote: Fri May 03, 2019 1:45 pm Found problem removed water sensor on back of engine cleaned it out and all is well. Did get a little dock rash today messed up the letters on starboard side.

You have a mercury warranty too. Consider going to a local mercury dealer and not cobalt bc of the 3 hour drive. With that policy they can bill mercury when they figure out the issue if it is engine driven