Gas pumps typically have a set pre-authorization amount when you swipe/dip/tap the card, typically $75 to $100. When the transaction is done, the pump sends a transaction complete signal which is signals to remove the authorization and then the actual amount of the transaction is transmitted. I also found a few declines but is only one instance when setting up the card with Uber Eats, it was actually declined. Then I immediately tried again and it was authorized.