take a zip tie - go UP through the slot on the lid, feed a 1"+ piece of fuel tubing through it all the way down to the lid.
Loop the end of the zip tie back down and force it into the fuel tubing until the end just peeks out.
This forms a real nice loop that your pit guy can grab and open easily and quickly.
I got the idea watching Barry's pit guy grab his car and, with the same hand he was holding the car, open the tank with his thumb and fuel the car with his other hand. Very nice and very neat.
RC10L2.5W - RC12.4 - RCNTC3(bmi) - TC4 (modded) - B44.2 - plus rent-a-rides! :D