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Water doesn't pump through the system - what's wrong?

post #1 of 25
Thread Starter 
I recently made some changes to my water cooling loop, and now the pump doesn't move water though the system and I can't figure out why.


The picture that I have is old (and it was working) and I've labeled everything with the changes I've made. Hopefully it's not too confusing.

*



It seems like there's some kind of pressure on the system keeping water from moving at all.
When I try to fill the system through the fill line I've set up, the water barely trickles in and seems to be stuck. Drain line doesn't work either, it's like there's some kind of suction holding the water in.

But more importantly, when I turn on the pump, I can see the turbine spinning sporadically and not really doing anything. It's not moving any water.

What is wrong here?
Do the 90 degree fittings restrict flow that much?
Perhaps my pump isn't strong enough?

Physics just isn't working out for me today.
Edited by The_Juggler - 2/8/13 at 6:53am
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post #2 of 25
Do it a different way, take a picture of your current setup, your diagram isn't easy to read tbh
post #3 of 25
Is there water in the drain tube after the pump? I had a similar problem when I added a drain line to the unused outlet on my pump. All I did was unscrew the drain plug a little bit, left the pump off, and let water naturally flow into the line. After that it started working fine. Having the fill port unscrewed a little bit too also helped.
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post #4 of 25
Thread Starter 
Quote:
Originally Posted by morencyam View Post

Is there water in the drain tube after the pump?
Yes, I was able to get the drain tube to fill with water, but it might have had some air bubbles. I'll double check that.
Quote:
Originally Posted by morencyam View Post

let water naturally flow into the line.
Water doesn't seem to be naturally flowing anywhere.
While working on it I just disconnected the fitting from the bottom of the reservoir while it had water in it, and the water didn't even flow out.
I could turn it on its side and kind of shake the water out, or blow into the system with my mouth (probably not good) but it doesn't just drain out from gravity.


Is this system poorly designed?
Perhaps gravity is not working right?
Any other tips?
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post #5 of 25
So there is some sort of pressure holding the water in the res then. Did you unscrew the fill port? The air needs somewhere to escape when it is replaced by the water, and vise versa.
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post #6 of 25
is there a place in your loop for air to escape?

its like holding the top of a straw, if air can't push the water then the water isn't going to flow in.
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post #7 of 25
Thread Starter 
Well, I guess not.
My old system worked just fine, which was pretty much the same thing minus the fill/drain ports.
I used to fill the system by pouring directly into the reservoir.

I suppose the pump won't circulate water through the loop for the same reason?
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post #8 of 25
My guess would be your reservoir is to low for your setup. Try unscrewing your reservoir and moving it up higher. What I think it is is the pump is having a hard time sucking water and pushing all the way to the top of your case without the water flowing down the other side. Which would help pull the water through the loop.

In a full flowing loop, you have water you are pushing against gravity to go up, and water that is pulling by going down. Gravity is resisting/helping you.

In your loop, it is only pushing against gravity. Until it is full and flowing back down. My 2cents.gif
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post #9 of 25
I'm a little confused: is the reservoir full when you try to run the pump?

If so, I can only imagine that you either introduced something into the water that plugged something up or that something came unstuck when you drained it, then lodged itself into a tight space (like the CPU block or something) and blocked the flow. A picture of your current setup would be nice.

Just stating the obvious here, but you checked your fittings when you got them to be sure there wasn't anything stuck inside them, right (like packing material)?
post #10 of 25
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

I'm a little confused: is the reservoir full when you try to run the pump?
Yes, the reservoir is full. I have problems filling it though the fill line, but I can fill it by pouring directly into the res instead.


Quote:
Just stating the obvious here, but you checked your fittings when you got them to be sure there wasn't anything stuck inside them, right (like packing material)?
Well yes, but perhaps a double check is in order. I don't think there is anything stuck anywhere, it seems like a blockage would behave differently than this. It seems more like an issue of pressure.


Quote:
A picture of your current setup would be nice.
I know, sorry about that, I didn't get a picture of my current setup.
The current setup is almost identical to the picture that I posted, but with the fill lines and drain lines added. The tubes run a little different, I wanted to improve the layout and design.
Also a larger reservoir.


I'll try and get a better picture this evening.
Hmmm, it will have to be from my phone seeing as I don't have a working computer right now sadsmiley.gif
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