Engine won't start

Thank you for the answer, actually when I turn ignition ON, I can hear the fuel pump turning, a friend of mine advised me to put some injectors cleanser liquid in the fuel tank and force the ignition because it did not really run for two years so still same fuel.
Also, when I try to start the engine several times, I can smell fuel vapors at a time.
What about if I change the fuel pump relay, where is its location?
Thanks a lot again.