Thank you !
thats very kind of you to take the time to look it up.
I was afraid you d say the + ignition goes directly to the injection relay.... I suspected as much but what baffles me is that the wire I ve hunted from the relay is réd/Black yet the switched 12v at the ignition switch is Black and yellow ! So where does it change colour and how ???

If I can t figure it out I will run another switched 12v to the injection realy like you suggested and the problem will be solved but I d really like to figure out what is going on !
tomorrow I will try and follow the réd Black wire a bit further if I can... it must arrive at a connector somewhere or a relay to be able to be plugged in to the yellow/Black ignition wire switch.

Anyhow thank you very much for your help you ve been grand. I will keep you updated with my progress.
cheers !