Plumbing question ?

[intarsiabox]

Originally Posted by belzebuth

I guess I will have to look at the current pump... not sure if it's "self priming" humm...

This was mentioned because in your drawing you have the return pump having to draw water up out of the sump. Because the plumbing to the suction side of the pump is vertical, the pipe will have no water in the line at start up and pumps can't pump air. An option would be to drill a hole for a bulkhead towards the bottom of the return section of your sump that the pump's suction line can be attached to and have the pump sitting at the same level as the bottom of the sump and not elevated. Option B would be to leave it as you have in drawing and see if you can find a PVC foot valve to attach to the intake pipe in the sump. This way you would only have to fill the return line with water once and the valve will prevent the water from pouring back out of the line when the pump is turned off, hence keeping your prime.