I need to replace a fuel line on a 2000 Bonneville SE. My question is: Where the nylon line from the top of the fuel rail connects to the steel line to the gas tank; Are these two lines just press-fitted together? No orings or special fittings?

If you look just slightly below the master cylinder of your brakes, you'll see the fuel lines where the plastic changes to metal. The plastic is mostly shrunk over the metal..

Which part do you need to change out?

Yah pretty sure thats a permanent fit, looked in the service manual and nothing on replacing just the nylon, but rockauto sells the nylon just not bent properly

The plastic line. While replacing the line with the elbow/quick disconnect that connects to the fuel rail I bent the line fairly severely trying to get the union into where I cut the line.I don't feel safe leaving it in place because I'm certain I weakened it. I was just going to replace the whole setup (new quick disconnect to fuel rail and plastic line connected to metal line.

Thanks crunkfrunk

So it sounds like you need nylon and metal as one piece, is it the supply or return? (bigger or smaller metal tube)

Take a look at 1993SLE'* new braided fuel lines. That might be a lower cost fix. Many of us have done them and it works great.