AU Running ULTRA rich - Need advice

[ten[A]cio[U]s]

Hi!

So quick summary. I went to work in the AU a few months ago. No bingo. It turned out to be the fuel pump.

I tried replacing with a walbro in tank and it was super rich. I found a full pump and replacement cradle on ebay to see if that at least got it going. It got worse.. it barely idles in gear (brake and throttle required), quick rev results in a huge black spot on the ground and huge cloud of smog.

So far I have put new fuel and some injector cleaner in, wiped retuned, tried to reset idle..

My thoughts are potentially fuel filter? O2 sensor?

Has anyone had this issue or does anyone have ideas?

Cheers in advance!