Last try Mercruser Beating this horse

[dogwspts]

Ok guys.. Have a 2017 Mercruser 4.5  250 horse Bravo 3. Showing low block pressure alarm occasionally after a long run. Temp never gets above 149. It starts out with good block pressure at 18 to 20 as the day goes it may drop to 7 or 5 psi. at the same rpm. Always shows 2 to 3 psi at idle. Sometimes it alarms and goes into guradian mode. No showing any code checked by dealer.  Is my boat haunted. Driving me crazy. Oh and it only has 50 hours on engine. 

​​​​​​​Thanks Guys

[Driller]

Ok guys.. Have a 2017 Mercruser 4.5  250 horse Bravo 3. Showing low block pressure alarm occasionally after a long run. Temp never gets above 149. It starts out with good block pressure at 18 to 20 as the day goes it may drop to 7 or 5 psi. at the same rpm. Always shows 2 to 3 psi at idle. Sometimes it alarms and goes into guradian mode. No showing any code checked by dealer.  Is my boat haunted. Driving me crazy. Oh and it only has 50 hours on engine. 

​​​​​​​Thanks Guys

Maybe this has nothing to do with your problem, but maybe it does. This group thinks it might be connected to the shift lever. Read and draw your own opinion.

They do mention the following:
- Low Block Pressure alarm
- Guardian Mode
- No code when checked

I have no idea if this is your problem and just conducted an internet search, but it sounds like the same symptoms you are having. Doesn't look like 7-5 psi is too low for your block pressure.

http://www.marineengine.com/boat-forum/ ... -Press-Low

[dogwspts]

Thanks. Read article sounds close . I sent them a post. At this point I am stuck....