Fuel line branch --- question on sitting fuel

[Discseven]

If a fuel line has a horizontal “T” with a branch running about 2.5” to a pressure gauge, that horizontal branch will fill with fuel. As I see it, fuel in that branch will not circulate---it will sit.

Bottom line: Am wondering if that trapped/sitting fuel will cause any issues over time?

I could put a vertical branch to gauge and so trap air (instead of fuel) inside branch but a vertical plumb to gauge has it's own problems.

Horizontal branch is optimal but not if trapped/sitting fuel is a problem in the making.