Crazy Physics: What is the first tank to be filled with liquid?

Answer quickly: Which of the tanks below will be filled first?

If the tap flow equals the connectors, just think a few seconds to get the correct answer.

The last tank (4) will only begin to fill when the liquid reaches the same level as the connector.

Since tanks 3 and 4 are on the same level, they will leak first, as you can see in the animation below.

So, did you guess?