* Sigh *
Hi Mike.
As has been told to you by numerous people, get someone to look at it.
The diagnosis points you have given are not descriptive and definitive enough to pinpoint the exact problem ( and why would a qualified person spend hrs on here trying to anyway )
It could be anything from a faulty reg , split hose, leaking injector, filler neck incorrectly fitted ( my guess as I told you before ) , MAYBE running rich, bad plugs, and the wrath of god ( well maybe not the last one )
As has been explained to you before , rather than ask 15 different people at 20 different times , which pisses everybody off cos you get there advice and then ask someone else , go to one person , pay the money and get it sorted.
BTW if you smell fuel is cos it's is unburnt or leaking which is RICH , not LEAN.
And in case you missed the post from 2 nights ago , all ulp cars run black exhausts.
It was the lead that caused the grey colour in the pipe
Cheers
Ken