Finally been able to spend some time on the XR today, i have connected a permanent live to the fuel pump and bled it through to the fuel rail, after plenty of turning over and pumping of the throttle i still had no luck starting.
when i pulled a plug to check if i still had a spark i was amazed that the plug was dry without a whiff of petrol.
i checked the fuel rail and this was still full of fuel so i had a spark and fuel at the rail but nothing in the bores.
with the electrical tester out i checked the following,
Power to ecu operating on ignition and power to the injectors when cranking.

next i earthed out the injector wires to listen for the injector operating. at first i had nothing but after a few attempts number 1 and 4 started operating when earthed.

is there aometing i could be missing that is isolating the injectors like a cut off or protection circuit?? i have to say i'm lost now!!!!!