water leaks from lid of pump

No bubbles when pump is on.
Gasket is present only two months old.
When pump is turned off large rush of water goes back into the pool after pump is turned back on. When on very little water in pump. when off pump basket is full of water and excess water leaks from top
 
Yes their is a thin gasket.
Looks something like this. Replacement Motor Seal Gasket for Summer Waves SFX600 SFX1000 Filter Pumps from SummerBackyard.com | Free Shipping
It inside the slide, in the grooves

You may want to disassemble the pump, add lube to the gasket and carefully put everything back together. Inspect the gasket as well. If everything appears normal and you put everything back and there is still a leak, you may want to place a silicone designed for bathtubs. It can easily be removed. This should do the trick in sealing everything up. Might as well pick up everything at the same time and then you can always return what you do not need. This would be your best bet. If the gasket is bad, then you will have to order a new one.
 

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