I would love for you to reconsider that approach. There are add-on sceneries where the ground polygon shows quite clearly where the fuel hydrant is in real life. It would be very nice to be able to edit the position of GSX's hydrant to match that position in these cases.
Have you read my previous explanation why this can't be done ?
Of course it would be "nice" to edit the fuel hydrant position on ground, but that would require a whole new different kind of technology to add to our software which is just not there, which is a kind of Advanced Inverse Kinematics that is NOT supported by the sim, so we would have to write it from scratch.
It means simulating a vehicle in the middle of two cables that can stretch, and it would cause a whole new class of problems, because it's very likely to end up in positions which couldn't be mathematically solved, because the cable end points might end up in impossible positions, due to editing the ground hole to match the scenery AND having to match your parking positions to the rest of the system.
So no, it can't be done easily, not without an almost complete rewrite of GSX, because if we had this kind of advanced mechanics, it would be sensible to apply it everywhere so, in the future we might eventually get it, but not as a quick and simple update to the fuel truck.