QLF

Your information given is mostly similar to the dealer in my country. I will assume as well that I am getting good flushing for now till the first service will show if it's good or bad flushing. Thank you.

Yes, almost the similar thing, in fact, I have an additional thermostat as well & maybe you did remove it in Yamaha to avoid the heat sensor. Yes, connector port running the flush with the engine off for sure. Sure will return to my old water pump which is 25 PSI. Thank you.

Yes, everything works perfectly. my engine is brand new mercury still 10 hours of working time. The pee streams flow without any problem while running, the problem is only while flushing the engine from the "Connector" using dc motor and water in tank of my boat. So if I came from the trip and the engine is normally cold 120-140 F degree is it fine to flush it only until I see the water comes from the prop while the trip is all the way up? or is it important to do the flushing until I see the pee stream flowing the water perfectly? Thank you for reply guys.

Greeting, I have a problem in flushing my Mercury 150hp SeaPro Outboard engine using the Flushing connector which is in the engine, and also I have tried: - DC water pump 12v 7.7L/M with 25 PSI - DC water pump 12v 7.5L/M with 160 PSI - City water hose None of the above success. after I started the pump for maybe 2 minutes it stars to flow from the propeller side only but not from the pee stream. I have tried the tilted & Vertical position. Please help I am using the engine without flushing it and its a problem keeping salt water inside. Thank you, Yousif