Luckily, there is no need to search for petrol stations within the vicinity of Barcelona Airport there is a Galp petrol station service located within the grounds of Barcelona Airport.
This page gives the location of the petrol station, opening hours and how to find the filling station.
The Galp Petrol Station is located at the only entrance by car to Barcelona Airport. From outside Barcelona Airport, you will see road signs directing you towards the petrol station. See below for more information on how to find the petrol station.
The petrol station itself is open 24 hours a day, 365 days a year. If you wish to use the car wash service, this operated between 07:00 - 21:30.
The Galp Petrol Station sits near the entrance to the airport. On entering the airport from a ring road you will have the option of taking a road that leads to the left or a road that leads to the right. Take the road that leads to the right that heads towards the terminals. The petrol station will be on your right.
If you are returning a hire car to the airport, it is worth leaving with enough time to ensure that you have time to return it clean and with a full tank (if that is what is required by the car company). In busy times you may find yourself having to wait a while to return your car if there are a lot of people returning their hire cars. For more information on hire cars, see Car Rental at Barcelona Airport: BCN Airport Car Hire Agencies.