water psi

[blueblaze]

Hi guys, can someone help me out here? I have a 150 vmax (carb) yesterday i notice

my water psi was next to 10 while i was running. I have not moved any thing or added.

I made sure that my trim was not to high. Most of the time my water psi is 15 to 16.

I have checked the water intake on the L.U they were fine,any ideas ? Thanks in advance

[TZX190]

You might need a new water pump impellor. Mine did the same thing, so I changed the impellor and my psi went back to normal.

[blueblaze]

I just done that last year. It has been ran alot . Should it go that quick?

[Trent_in_BG]

I have been told that if you use the boat alot you should have it done yearly.

[blueblaze]

Took it to the shop, yep water pump.

[HAWKFAN]

I had the same thing happen this weekend. I was told by my mechanic that running ten is acceptable, but anything under is not and I should come back in if I drop below. I just replaced the impellar in March and have only put about 10hrs on since. I have a feeling the the hot weather may effect the pressure. What do you guys think.

Thanks

[ChrisH]

hot water does affect the PSI. the thermostats are going to open more creating less pressure but more volume.

[blueblaze]

I agree, but it had me worried because i was told nothing below 12 on yamaha. I dont know if thats true or not but i didnt want to take any chances. Thanks for the replies guys