Touareg 3.0 v6tdi wont start

[Jmac]

That 100% sounds like air. Air and diesel , don't mix if you have done the VCDS prime I suggest you do it several times, even with Golfs especially with the Bluemotion it takes atleast 2 ECU primes. If you have done that then it must like Transporter suggest be getting air in. It was ok before the fuel filter was changed therefore introduced fault
Good luck

[silverado25001]

Thanks jmac , do you have any ideas how to purge air from the system , I have had feed and return lines off trying and probably introduced more air .
Regards Silverado25001