A short video would make it pretty easy to diganose.

D5 pumps can be hard to clear the air out of when first installed dry, you may need to move and shift it around to break up the air in it before it can build the suction to pump water.
 
I am assuming you have the intake/exhaust ports correct and checked to make sure it's vibrating when powered. But it's probably the air pocket in it, I own a D5 that's 13 years old and still going strong. Always takes mine several power cycles and gentle shaking to get it entirely clear of air whenever I drained the loop.

Maybe - one of your plugs or fittings it too long - it may be blocking the fluid at that point - in your loop

If you have the pump on long enough length of hose then raise the D5 above the system, any amount you can - it should gravity feed through the pump - as long as the air can escape - from a high point in the loop.  (your using the top of your reservoir as the return, might want to move / (remove) that, at least temp for a quick test)
 
I know that EK CPU water block Is Directional --> the flow only works one way

My D5 powers My build Nibbler - 3 - GPU, CPU & 2 Radiators - those pumps have plenty of pressure
 
Tests:
- pump to bucket - distilled water
- take CPU out of loop - does it flow ?
- take GPU out of loop - does it flow ?
 
 
 
 
 

which part number - Singularity Computers & D5 pump reservoir combo

No - the 90 should not cause an issue, even if you have several of them
 
EK - does warn about "long threaded" fittings - have the ability to block ports
 

Thanks anyways for the help. Seems this Forum is good. I look forward being here.

Are you sure the power plugs wiring on the pump is the same as the plug coming from the psu/mobo etc... ? Maybe that the wiring is different for different manufacturers. Sure sounds like impeller not turning. 

Sorry I've been away. I've been extremely busy with other things in life. I'm glad to see I'm getting a lot of support with my problem. Great community here on the EVGA Forums.

Wmmills, either pump is working. I can guarantee this.

Kougar, Pumps and blocks are cleaned. I've taken apart everything and inspected, cleaned and put together again. I like how you sent the link to Jay's Two Cents. I'm a follower of his channel.

Cool GTX, pumps are running as they should. I get a little bit of a cyclone effect but not enough to cause air into the pump. It is worse with the 150 mm reservoir. I've even tried my 250 mm reservoir on both pumps for more gravity feed pressure.

Blowing into the one of the spare ports at the top of the reservoir doesn't do much for pressurizing the reservoir. I'm a smoker for 20 plus years. Lungs aren't up to it any longer. Haha.

I've tried to disconnect the last hose running from the GPU block to the rad this morning and trying bleed out air while the pump was running. No luck. It's like I don't have enough 'Head Pressure' with either pump.

To all, I'm going to leave the pump on by its self all day today with the reservoir open for air to escape to see if it will prime enough to get the flow going. So far, the past hour it's filled everything, CPU, GPU and radiator but there seems to be air still in the line between pump and CPU block, CPU block and GPU block and between the GPU block and rad.

Thanks again for all the help. Again, I really appreciate the community here.

Hah, pretty funny. Glad ya found the problem!

KKnoll
I'm glad as well... And feel a little stupid at the same time.

Don't sweat it, most waterblocks used to be omnidirectional so it often didn't matter. Now with them being hyper-optimized I guess it's a thing of the past. And if you buy a Threadripper, the chip is a giant rectangle so there will only ever be a single way to remount the baseplate to put the block back together anyway.