Water psi for a merc 225 efi
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Posted on Monday Jun 13, 2011 at 9:23 PM  
Im getting between 8 to 10 psi at around 5000 rpm. We looked it up and it said 8 to 10 psi min at 5000 rpm. Is that low? I put a new water pump in it and new water gauge. Not sure if the gauge is working properly. Haven't heat an overheat alarm. Always thought they ran around 21 or 22 psi while running. How do you test a gauge?
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Posted on Tuesday Jun 14, 2011 at 8:47 AM  
impellars are cheap!! change it out and be sure.

My Opti always runs 17-18 WOT.
Posted on Tuesday Jun 14, 2011 at 9:49 AM  
i just put a new one on last week.
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Posted on Tuesday Jun 14, 2011 at 10:50 AM  
10 to 12 on those motors. You. Can clean the poppet valve and see if that will help. They get clogged pretty easy.
Posted on Tuesday Jun 14, 2011 at 10:54 AM  
is 8 to 10psi going to my boat in if it stays that way?
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Posted on Tuesday Jun 14, 2011 at 10:59 AM  
For some reason I thought you had a 1999. Mercury started adding an extra set of pick up holes on both sides of the lower unit to allow better water pickup on the bigger boats that cause a lot of cavitaton. Smaller boats like bass boats just benefit from it. It is a low pressure high volume system. 10-12 wot and 2-4. I hear a lot of people saying those old EFI s just pee different at random for no reason. That is wrong they might pee different because the system is clogged or several other reasons. Just because the telltail is peeing hard or bad don't mean the motor is cooling or not cooling goes both ways.
Posted on Tuesday Jun 14, 2011 at 11:17 AM  
10 is good
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