Next time you go there, take a can of yellow spray paint.
Extend the hose to its fullest limit, then walk around the pump, holding the hose at max extension, and 2' inside that, spray the reach limit on the ground.
Next time, land with your fuel cap on the line, and you should be OK. If the owner is anything like you say he is, he will not notice, and the fuel man will be glad you did it.
When the airport owner sends you a bill for the graffiti, send him one for your time and paint.