fuel pump relay

[scots1810]

Hi, my A3 2.0 tdi 2006 engine BMN, just cut out on me yesterday, RAC came out, it was like fuel starvation, he checked pump in tank there was no power going to pump, he tested pump and said that was ok,. He tried to locate relay for it but could not 100% identify which one it was,he scanned ems only code was crankshaft sensor, but that could be historic,his words. now ESP light has come up on dash, at a loss to what is wrong, and where the relay is located. Oh car still wont start. i have got new crankshaft sensor looks a real pain to fit,but will have a go next week.