Take a look at this
Google map They are some gas stations in the "Shipley Corner" area. The Rental Car place is located in that rectangle of roads just south of the words "Stony Run", west of BWI
Also, there is a Texaco on West Nursery Road off of the BW Parkway (Hwy 295), in the "hotel district". Zoom back out from
this map to see where West Nursery is in the bigger scheme of things.