Congratulations,
I do not think it is a good idea, the person who wants to fill up the fuel will want to do it quickly and will not wait for the transaction to be confirmed, but you can create an ATM machine so that the person can withdraw from it or a machine for drinks and juices where you can pay with the lightning network.

You can also provide some services and put the Bitcoin logo accepted here, such as changing oil or repairing tires, etc., and with a 5% discount, you will get double interest.