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didnt you see my duct tape LOL. I only removed the tape when i was back flushing the hose

My condition is worse, low PSI even when starting it cold, only 5-10psi at cruise. Thinking it may be a problem on the intake side of the pump. Hose looks perfect going from L/U to Transom. Could be the transom fitting i may pull the drive and look inside with a scope. Checked the new pump and...

Those are great numbers. Mine takes about 5 seconds to get 2.5 psi cold at idle, and 25 seconds to get 2 psi warmed up at idle. Crazy

Im gonna look at those thanks so much!!!

only does it when warmed up, builds pressure right away when its cold and thermostat is closed. Maybe it needs more flow and cant get it when the thermostat is open. But it never runs hot. i did run a cam up through the transom just saw some surface corrosion nothing major

I agree, theres less backpressure when the thermostat opens, so less pressure at startup when its warm. Always runs fine, just trips the alarm when starting it after warmed up. Just an annoyance!!

So use the muffs and see how much water comes out the bypass ports on the sides or the exhaust through the prop? Engine off?

no possiblilty at all i replaced it many times same result. If it was faulty it would do it wether the engine is hot or cold. Thanks again

Yes im sure its for water pressure, all testing is done with the techmate pro scan tool and the boat in a fresh water lake with open cooling. Impeller and pump housing are new with great pressure on cold starts, just slow to build pressure when warmed up. Pressure is fine in cruise always.

Haha yes thanks for finding my old post, Its standard cooling, the poppet valve is in the thermostat housing

Impeller is new and so is pump. Check balls would definitely keep me from having enough back pressure. How do you check those?

Hi group, still having the same problem here. When engine is warm and thermostat is open, i dont have enough back pressure to build up enough water pressure fast enough to keep the alarm from going off. When the engine is cold it immediately jumps to 2.5 psi and doesnt have any problems. This...

Well dangit it has the green T installed. Maybe its just a design flaw that allows a little to much water to the exhaust since its the first year catalyst motor. Look how many places the water splits off to the exhaust its no wonder it has any back pressure at all. Where could i add a...

that makes sense, this is the first year of the catalyst motors. Would be easy to use the wrong T on the assembly line. Would explain everything especially why i dont have a problem untill the thermostat opens and decreases backpressure. Ill check for the correct part number

ill keep skyman2112. Did you see my water flow video? Does it look sufficient?

yes its both my profiles, i couldnt log in 1 day. The motor has a 5psi oil pressure switch i was told to delay starting. Its always started this way since new. I will check those voltages. It has a 3 wire sensor so its no longer grounded to the case of the cooler as in the 2 wire sensors.

yeah thats the most common reply i hear of. Did you see my water flow video? Does it seem restricted to you? I was just gonna reduce the input voltage to the water pressure sensor by using a voltage divider. You wouldnt happen to know the values of resistors i could use for that would you...

hi again still struggling with my low pressure alarm. I see a Tee just above the pump output line that goes to the exhaust riser. Its a small diamter hose not sure what i should look for? Heres a video of my scan tool readings done with the boat in the water, not on shore. Then a video of the...