240 custom sump overflow issues

Swoll929

Exodon
MFK Member
Jul 2, 2017
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So I have a 240. 8 x 2 x 2. I drilled the aquarium myself Built My Own sump Built My Own stand and everything is going great except I cannot get the flow through my overflows I expected.

I have three one-inch overflows drilled into the back of the tank and two three quarter inch return lines using two Rio 3100 pumps and a 40-gallon fluidized sump. Please see the pictures of Plumbing attached. I am assuming my flow issue comes from the length of run since all overflows go to the far end of the tank. At the moment I can only run one pump otherwise the water level in the sump drops so that the pumps are no longer submerged. Obviously the overflows are not returning as much water as the pumps are pushing out. At this much head pressure I should only be pumping 1200 gallons per hour and my research says that 3-1 in overflows should do 1800 gallons per hour. Is the issue purely in the length of run for the overflows? Or do I have another issue? They are definitely not clogged as they are brand new.
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Any ideas on how I can better this?
 

Grinch

Dovii
MFK Member
Apr 23, 2014
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Are your overflows vented?
 

Swoll929

Exodon
MFK Member
Jul 2, 2017
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Yes

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Grinch

Dovii
MFK Member
Apr 23, 2014
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Problem persists with cap off?

Are the drains making a lot of noise?

Will the tank over flow if you add more water?
 

Swoll929

Exodon
MFK Member
Jul 2, 2017
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Yes the problem does continue with cap off.

They are relatively noisey

I can add more water, but the level i am at is where if power goes out i dont flood the sump.
 

#.$

Candiru
MFK Member
Jun 26, 2017
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Can u send more detailed sump pics such as pump placement and direction of water flow
 

Swoll929

Exodon
MFK Member
Jul 2, 2017
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I am fairly confident it is the length of run as the shortest run sends the most water by a large amount. Here are the pictures sorry for the crude drawing hopefully it is legible. Thank you for the help in advance.

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Grinch

Dovii
MFK Member
Apr 23, 2014
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I think the next step is to see if you can achieve balance by adding more water. If the answer is yes, then the sump is too small for your setup.
 

Swoll929

Exodon
MFK Member
Jul 2, 2017
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Okay so just to be clear turn both pumps on add water to the tank and see if the water level rises to an acceptable level in the sump?
 
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