It is indeed unique to the 3147 Jetfires. Here is the image from the service manual.

It’s certainly not a pressure regulator, As mentioned, I suspect it possibly supresses spikes in fuel pressure, much like an expansion tank in your home water plumbing.

I am certain it is OEM. If you look at figure 8-177 part C on page 544 (section 8-154) in the original 1963 Oldsmobile Service manual, you will see it illustrated.

I used an Edelbrock aluminum intake manifold with an Edelbrock 1403 ‘performer’ 4 bbl carb. A nice combination. The Edelbrock intake manifolds are still available. Probably the only reason why is because the 215s were used for years on the Landrovers.

I contacted Hal at Classic Preservation. We identified what I need and have a kit on order. Thanks for the suggestion!

I do have a question. What is the function of the bulb shaped device that is plumbed into the inlet side of the fuel pump? Is it some sort of fuel surge chamber? I have attached a pic of it.

The fuel pump I have works fine, but is off the car right now, so I figure it’s time for a little preventative maintenance on a 57 year old item. 🙂

Yep, that’s all I need. Thanks Eric!

Thank you very much!