The correct answer is: no article.
The reason is that we are not talking about a specific petrol station, but any petrol station. We are simply expressing our hope that we will reach a petrol station soon.
If we were talking about a specific petrol station, we would use an article. For example, if we were talking about the petrol station that is on the corner of Main Street and Elm Street, we would say:
- "I hope we reach the petrol station on the corner of Main Street and Elm Street soon."
In this case, we are using the definite article "the" because we are talking about a specific petrol station.
However, in the original sentence, we are not talking about a specific petrol station, so we do not use an article.
