Fuel tank leak after replacing

I recently replaced my fuel pump in my car.
I smelled gas and pulled a P0442 code. After filling it up, I found the tank leaked at the fuel pump mount. I put a new Motorcraft seal in, but it did not fix the leak. I took it out and ensured all surfaces and o-ring were clean. I ensured the pump plate laid flat before tightening down the lock ring. It still leaked. I have a new Motorcraft locking ring coming tomorrow, hoping that will solve the leak. Am I missing anything? Is there a sealant to use? I have done this several times before, but not on anything this new and have never had this issue.

Another question regarding the fuel line. I cannot find any definitive information on how to remove this line from the pump. I am assuming pinch the tabs and pull. Is this correct?