Basement pump causes sewage smell

[toadhall]

Hi,
I have a basement pump for my washing machine. The outlet used to go directly into the outside drain but now it is linked to the waste pipes on the ground floor. Every time the pump is in action (when we use the washing machine), now the pump air pressure is enough to push sewage air past the u bends of my kitchen sink, smelling out the kitchen.

How can I stop this happening? Would another u-bend on the kitchen sink waste pipe help? is there a one way valve that i can install that lets waste water out but closes to air pressure the other way? Perhaps a pump that goes at a more steady action rather than in sharp bursts?

Any help appreciated. My kitchen stinks.

Thanks
Toby

 

[rpm]

Welcome to the forums Toby.
Why was the outlet re routed and think I may know what`s wrong but any chance of pictures where we might spot the answer?

 

[toadhall]

Welcome to the forums Toby.
Why was the outlet re routed and think I may know what`s wrong but any chance of pictures where we might spot the answer?

The outlet was rerouted as we had an extension done. I can't show the new plumbing work as it is under the floor where the drain used to be. The problem will have to be fixed 'upstream' so to speak

 

[rpm]

Meant picture of U bend and the outlet pipework from pump.

 

[rpm]

Hi,
I have a basement pump for my washing machine. The outlet used to go directly into the outside drain but now it is linked to the waste pipes on the ground floor. Every time the pump is in action (when we use the washing machine), now the pump air pressure is enough to push sewage air past the u bends of my kitchen sink, smelling out the kitchen.
Thanks
Toby

Without a picture all I can say is the most common reason for this is that the pump outlet is connected too close to the sink. All pumps activate at a certain point do not know of one that will give you your more steady action.

 

[PlumbBobBob]

more than likely plumbed in before the u bend

 

[rpm]

more than likely plumbed in before the u bend

Could be Steve however without knowing what pump is there and therefore what the discharge pressure is likely to be (15 psi or higher?) or a picture under the sink showing the connection we don`t know, did you note the part about pipe now being underground? Not many pumps like the discharge pipe to go down before a rise. Had one years back where the connection was +10" past the U bend and still could blast the plug out of the sink.