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Running very rich

Shortstuff

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2016 Golf GTI PP
I've just changed the Oxygen Sensor on my S1 VN V6 as it was using quite a lot of fuel and idling a bit lumpy. Having done that, it doesn't seem to have made any difference to fuel consumption or the idle. I smelt by the exhaust and it seems to be running very rich. There is also a lot of black soot collecting on the exhaust tip - much more than I would think is normal over a short time.

Over the past couple of months i've changed the injectors for a recon set and cleaned the throttle body and IAC valve. Doing this made a slight improvement to the idle, and fuel consumption went down from 20l/100km to about 15l/100km.

Is the next thing for me to change the Fuel Pressure Regulator (got a spare one here) and Fuel Filter? And if that doesn't work might the fuel pump have anything to do with the problem?
 

Shortstuff

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I'll change the regulator over today and see what happens. The plugs,leads and air filter are all a few months old and look to be still good.
 
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