I'm guessing you played the web version, when going in the gas station, a menu should have popped up asking you for money to refuel.
Try using the downloaded version if you wanted to try the bugless version
Viewing post in Tornado Taxi jam comments
I didn't do anything, and there was nothing when I enter the gas station. I just downloaded the game again and retrying it again and there is now a gas station ui. I'll be trying the game again and give a feedback. After trying the game out second time I notice that the game is extremely hard, you needed to get 2 passenger to even have enough money to spend on full gases, the upgrade that you wanted is outed of my list. If it is true that you can't fill your gases during tornado then, I'm not sure how was I suppose to beaten the tornado to get to the end screen. (my guesses is I should afk?)
The objective is to go for an highscore, the game over screen appear when the car finishes the fuel or gets destroyed.
I understand now thanks to the various feedbacks we got that the game was really hard and very unforgiving towards the player, future games will be easier to understand and more forgiving.
Thanks for the feedback!