Hi,
If it is a hose, then it is likely a vacuum hose. There are several, and engine vacuum originates at the intake, so it could be one of many.
I attached a pic below of the one I think you are talking about. Take a look at the pic. If that is correct, that goes to the fuel pressure regulator on the fuel rail.
If it isn't, take a pic of what you are seeing and upload it for me to see it.
Let me know.
Joe
See pic below.
Image (Click to make bigger)
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Sunday, August 1st, 2021 AT 7:49 PM