Adam Levine puttered out on the Sunset Strip Wednesday night ... after his gas tank hit empty.
Adam's classic '50s Mercedes SL rolled to a stop near The Comedy Store. His new wife, Behati Prinsloo, waited helplessly while a frantic Adam waited for a friend to hit up a gas station for a can of fuel.
An eyewitness tells us Adam seemed upset when people started noticing him. He hightailed it out of there the second his friend gassed up the car.