Leisure Bay Pump with Franklin Electric Motor

This pump is about 18 years old. It runs fine, but leaks under pressure. What do you think it could be and do you think I need a new pump?

Leisure-Bay-Pump-

 

Leisure-Bay-Pump-with-Franklin-Motor

 

Thank you for your email and pictures, I think that you can just replace the seal. Please send me the numbers off of the pump and I will get the seal right out for you.