I’ve owned about 15 Z cars over the years, most were 280Z. Still of course own my first 240Z. 
somewhere along the line, I put together a 280 with all new Factory EFI. I don’t remember what this is or does. I found it while setting up my new garage at the new house. I don’t suppose I need it, but I’d like to know what it is!

Fuel Pressure Regulator 

Yep goes in the middle ish of the fuel rail

Nice. Does it actually regulate fuel pressure or just lend a vacuum reference? 

Yep, should regulate.

This is from the 280Z Fuel Injection Bible, yours just has one inlet.




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Those are on the '78s better designed rail if you ever want to sale it.

I don’t need it, and I’m not running a museum so I’ll sell it. Just have to figure out what it’s worth.