Ran across one of these this week. I had no previous knowledge of them. Wasn't fully convinced it was a GM project, but the AC Delco Variable Fuel Sensor made me look into it.





Metal, silk screened decal on the manifold;



Nothing of interest on the Emission Control Sticker, not even California emissions;



Different label on the fuel door;



No unique markings on the dash or instrument cluster.

The GM Service manual supplement is readily available;

https://www.amazon.com/Lumina-Variab.../dp/B00435N4KG

Even found some info on emissions presented at an SAE conference;

https://pdfs.semanticscholar.org/980...ab3cd07e73.pdf