Howdy dasuto247,
The refueling areas in my scenery are usually visible from the runway. There is always a red gas pump quite visible and usually the red gas pump is sitting in front of a "nose" hangar- one of those hangar-type-a-small deals. There may also be oil tanks adjoining the location. When next to the shore, as most of my airfields are, there are also float plane refueling areas that can be used from the water- again also marked by the red gas pump and at least a nose hangar. Also, my scenery has a wide assortment of places from which you can start in free flight: such as inside revetments, inside hangars, at refueling areas, the other end of the runway beside the default end as well as start points for float float planes in the water. To access one of these "menu entry start points", as they are called, use the "Advanced GoTo" menu. From there choose "Scenery from FS95 and before". Then choose an airfield from the "Scenery Areas" list and then choose a start point from the "Search Results" list.
To use a refueling area you just need to taxi up near to one and stop. After a couple of seconds your tanks will magically refill. My refuel areas on the airfield are usually 200 feet square. So anywhere within 200 feet of the gas pump on the side facing the taxiway or apron along whose edge it sits. The float plane refuels are usually 400-500 feet square extending from the shoreline out into the water..
MR