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Really Dumb Pump Question

Just wondering where its pressure would top out at. I'd hate to have to disco everything just for a pump leak test.

Actually, problem got solved. See, I am using an old power supply to run my D4 12 volt pump. It is rated to run on a range of power settings, but I was told that unless you had at least a 5 volt sense strand, you couldn't do the resistor trick and have it affect the 12 volt side of life. It does have a 3.3 volt sense strand and for hits and grins, I put a 100 ohm resistor between the 3.3 sense lead and ground and now I'm at 16.7 volts and the pump is pushing out just a perfect amount of water flow for my system. 😎
 
Here's the deal as I understand it now and it MAY not apply to every power supply out there, so proceed at your own risk!

Most modern and quality power supplies have a yellow sense strand for the 12 volt side of life and a red sense strand for the 5 volt side of life and a orange sense strand for the 3.3 volt side of PC powering life.

Some of the older or cheaper power supplies only have a sense strand for the 5 volts and the 3.3 volts and what you do with those power supplies is put the resistor on the 5 volt sense strand and it ups the 5 volts and the 12 volts to the same percentage of original value.

Then, if you are so cheap like me and find an old PC at the dumpster and scrap out a power supply... oh this looks promising!... it says CompUSA on it and 150 watts! 😀

That type only has a sense lead for the 3.3 volts and I was told you were out of luck on modding the voltages on that one, but I tried it and found the 5 and 12 were just slaved to the 3.3 on that power supply at least.

The moral of the story... if any!... never underestimate what you can so easily smoke test! :Q
 
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