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Bass Fishing Forum

General Bass Boat Discussion => Outboard Motors => Topic started by: Reservoir Runner on May 09, 2021, 01:39:40 PM

Title: 2012 Mercury 40 HP 4 stroke- Water pressure at idle
Post by: Reservoir Runner on May 09, 2021, 01:39:40 PM
Just curious as to what the idle water pressure should be on this motor. It is putting out a good stream and the guage is showing almost 10 psi. I had the guage replaced about a 2 years ago cause it wasn't showing the correct pressure. The water pump has not been changed as I only have about 10 hours on the motor.
Title: Re: 2012 Mercury 40 HP 4 stroke- Water pressure at idle
Post by: Mike Cork on May 10, 2021, 10:30:03 AM
10 PSI is pretty strong at idle. Most motors use 10-14 as a minimum at WOT.
Title: Re: 2012 Mercury 40 HP 4 stroke- Water pressure at idle
Post by: Reservoir Runner on May 10, 2021, 01:51:02 PM
Ok, Thanks Mike!
Title: Re: 2012 Mercury 40 HP 4 stroke- Water pressure at idle
Post by: Princeton_Man on May 13, 2021, 04:40:09 PM
Suggestion; if it's been more than a couple of years, go ahead and replace the water pump.
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