This car has been setting for two years, won't start. We're going to try the fuel pump first. Is the fuel pump located under the back seat-driver's side?

First, drain most of the old fuel from the tank and refill with fresh gas. Second, follow the 3 diagnostic questions in sections A and B below, when you are assessing how things are working. It may help you a lot.

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-honda-civics-46563.html

Fuel pump is installed in the gas tank. Access is through the seat/hatchback area.