She just stopped!!!!!

[Terryphukwit]

Hi all, if anyone has any info on known issues that could have caused this then please let me know..
All has been great with my S4 for best part of a year, that was until yesterday, came home from a ride out and literally at the bottom of my drive she cut out, in a very definite way, no messing about just stopped dead.... so far I have established it is fuel, filters off and squirt some into the ports and she fires up, then dies again. Pump runs at ignition on and I can hear fuel returning to the tank, well that is what I assume I am hearing, all wiring to the injectors looks fine, tomorrow I am setting up something to check fuel pressure, im guessing around 4 bar, if this is bad im guessing either pipe off in the tank or regulator is bad, if pressure is good it will be electrical and I am then buggered without some genius on here having some kind of clue what could be wrong as the injectors appear to be fed directly from the ECU.. Thanks in advance..