No, those 4x brass screws are part of the regulator (they're actually steel, with a chromate coating).
I think there could be a pump under the bracket the regulator is attached to. Maybe not, but that's how it appears. Lots of stuff crammed in there and lots of hoses, so hard to say.
In post 163, the silver thing you show should be a vent. They typically have a ball bearing in them too to stop fuel spilling if the car is upside down. But if it's mounted too low, it will leak fuel when your tank is full or when you go around corners.