I just did a backwash on my pool as we have had so much rain in the last few days. I have rinsed my sand filter and cleaned out my pump basket. I replaced the water in my pump basket and closed the lid and put the system back on filter. When I do that all I get are air bubbles out of the jets. And the water in the pump basket drains out and doesn't came back. I am worried that I am going to burn the pump. Am I supposed to keep the lid open on the pump basket or close it to prevent all the water from draining Please help!