That fitting supplies metered fuel pressure. This is a fairly low value and is a lesser pressure then what comes out of the engine driven fuel pump. The pressure here isn't normally monitored as pressure, but rather it is used to supply fuel flow information to a pressure type fuel flow gauge. That is it normally drives a pressure gage that is calibrated in gals per hour or pounds an hour. Most do cap it off, if not driving a pressure type fuel flow gauge.
Good Luck,
Mahlon
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