HELP my filter has stopped sucking water

Missy1313

I did a filter cleaning last night and did everything the same as I have for years. When I hooked my 406 fluval canister filter back up it wouldnt take in water. I tried priming it with no luck. I removed my impeller and checked it and all looks fine. My primer looks good. I replaced all my hosing and still nothing. I did a couple test bumps to see if impeller turns and it's good. I'm at a total loss on what to do.
 

BigManAquatics

No gaps in anything anywhere they aren't supposed to be? That's all i got...i haven't dealt with canisters enough for any other ideas :(
 
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kallililly1973

Did u full it to the very top wit water. That’s how we usually have to get ours going also tipping it back n forth and front to back will sometimes help .
 
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Missy1313

No gaps in anything anywhere they aren't supposed to be? That's all i got...i haven't dealt with canisters enough for any other ideas :(
No gaps check that over a few times.
Did u full it to the very top wit water. That’s how we usually have to get ours going also tipping it back n forth and front to back will sometimes help .
I will give that a shot.
 
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BarristanTheBold

I would agree with filling it full of water - I recently got a Fluval, and the manual says like "Do not fill with water!!!" when you open it up and maintain it. However, also having a Marineland Magniflow 360 (and another that the Fluval replaced) - it *needed* to be filled up before starting it. Is it making an electric sound and air noise when you plug it in, or is it just doing *nothing* at all?
 
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Missy1313

No gaps check that over a few times.

I will give that a shot.
No luck with that either. I filled it right to the brim. Gave it a tilt a couple times to get the water worked through everything and then filled the hoses. No water is moving when I turn it on. I can hear the motor going and I know the impeller is working so I have no idea why No water movement.
I would agree with filling it full of water - I recently got a Fluval, and the manual says like "Do not fill with water!!!" when you open it up and maintain it. However, also having a Marineland Magniflow 360 (and another that the Fluval replaced) - it *needed* to be filled up before starting it. Is it making an electric sound and air noise when you plug it in, or is it just doing *nothing* at all?
I tried filling it like the other poster had suggested and no luck. It sounds normal. Everything looks good but no water flow.
 
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Jonmott

You don’t really need to have the canister full of water to get it to prime, as long at the input side is full of water and the input is in the water in the tank you should be able to open the tap and let gravity do the rest. If you cannot get the input side full of water there is always a fool proof way of priming, take the output out of the water, make sure everything is empty, the can, both hoses. Now suck on the output, I know it’s nasty but this is the last ditch effort, now once the water starts to enter the canister gravity should fill it, once filled out the output back in the tank and turn it on, if everything is full of water you either have a broken impeller or a bad pump.
Good luck!
 
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kallililly1973

I would double check inside the housing where the impeller sits to make sure there isn’t anything holding it from initial startup like a rock or sand or a snail
 
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Missy1313

I had my husband siphon the output hose to create a suction for the whole loop and it seems to have done the trip. I have never had this happen in the many times I have done this cleaning before. It was weird and hopefully doesn't happen again. Thanks for all your suggestions.
 
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Islandvic

Consider removing the hoses and cleaning them out.
 
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DoubleDutch

These filter don't suck water, but only pump water out. The vacuum / syphoning makes the water flow in again.
So if it isn't primed correctly the impellor runs in air instead of water.

In case of an emergency you can always suck on the outlet and keep the outlet under waterlevel in a bucket until water flows out. Then de canister is primed and could be started.
 
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