Sorry if I am repeating myself Mateo as I might have suggested this before. Its an idea.

I would recommend making friends with one of the service companies in the UK and using Facetime with an iPhone on a gorilla grip mount.
https://www.amazon.co.uk/dp/B015UI8MRE?psc=1

Given the age of the car it feels like some seals in the fuel system have let go somewhere. The smell of petrol out of the exhaust could be a red herring at this point.

I would get the front wings/bonnet off so you can get your teeth into it. I would also look at using a local specialist to check out the basics. An hour of time from a local diagnostics on a van guy would at least eliminate some elements to get you further along ? The BMW engine is not so different from any modern unit in terms of basic elements?

Everyone loves a Morgan. Even me, unless it's broken again.