Do I need a new fuel pressure regulator?

[tinypanzer]

While working on my car this weekend, I broke the brittle vacuum line going to the fuel pressure regulator.

When I fit a new hose in there, I decided to suck on it to see if it was sealing well. It wasn't. Depending on how I wiggled the nipple, it would intermittently leak air. Here's the lame part. I tasted fuel vapor.

Is a small amount of fuel vapor here normal, or is my diaphragm going south? Also, can I just replace the rubber nipple or do I need a whole new regulator?

1990 300SE (M103)


Thanks!!