In my coupe it was the fuel filler hose. You can't buy it anymore from anyone, repco, rare spares, rubber places, nissan, N&M spares. I've tried them all.
best option is to get an exhaust shop to make up a metal pipe to fit and add some rubber joiners to seal it to each end with clamps.

I've also tried flexible fuel hose, but it wasn't flexible enough.
Anyone got a better idea let everyone know!
hope that helps, justin