Thanks Pete.
No the fuel that I flushed thru came out clean...and a lot lighter red in colour that the old crap fuel.
I will try with old filter to eliminate that . It is the correct way around but I didn't fill it with fuel but Has lots pressure when I crack the filter outlet (sprayed me in the face haha). Interesting about the 5th injector. Just had another play. Defiantly fuel going into mfi but not out of the 4 injector lines.
started and ran everytime before I swapped filter and filled coolant.
Stupid question but is there any link between coolant and mfi unit?