Texas Transportation Code - TRANSP § 647.011. Fuel Restrictions

(1) fuel the motor vehicle while the engine is running unless running the engine is required to fuel the vehicle;

(2) smoke or expose any open flame in the vicinity of the motor vehicle;

(3) fuel the motor vehicle when the nozzle of the fuel hose is not in continuous contact with the intake pipe of the fuel tank;  or

(4) permit any other person to engage in an activity that would likely result in a fire or explosion.