RockAuto review: Horrible business practices

I purchased and installed a fuel pump from RockAuto. The fuel sending unit that controls the fuel gauge was defective, so the fuel gauge did not work. I completed the return/ exchange form on their website, and attempted to return the fuel pump, but UPS would not ship it because it smelled like gasoline as a result of being submerged in gasoline when it was installed into the gas tank. Customer service instructed me to clean the fuel pump with soap and water and let it dry and attempt to ship it again, but the pump still smelled like gasoline since there are internal compartments, that cannot be accessed properly to thoroughly clean it. I explained this to customer service, but have received no reply. Even if I was able to return the pump, RockAuto would not pay return shipping or shipping for the replacement part.