hi all im new to this forum so if ive posted in the wrong place i apologise

i have a s1 rs turbo im curently rebuilding, since fitting the engine back in i cant get it to start
ive nailed it down to fuel but thats it

the fuel is pumping through the filter to the metering unit but going no further,is there a way to bleed these
i have spark, compression and loads of fuel just not getting to the injectors

any help is appreciated
ian