E30 Zone

Hi everyone

I have just finished putting my engine back together (old head was cracked). Now I get plenty of spark and fuel to the return pipe, but the engine won't fire. Does anyone have any suggestions as to what the problem could be?

Many thanks!
Marco

crank sensor?
injector rail not pluged in under manifold?

Timing out?

Not crank sensor or there wouldn't be a spark.
Which pipe exactly does fuel come out?

Thanks all for your replies. It turned out to be the fuel rail connector (there are 2 plugs which are interchangable).