Touareg 3.0 v6tdi wont start

**silverado25001** · 02-03-2014, 09:00 PM

Hello everyone , this is my first post and am hoping for some expert help. I have a 06 touareg 3.0 tdi and after changing the fuel filter the car started and ran for about 5 seconds and i havent been able to get it to go since .
I did prime the filter canister with vcds and have been attempting many techniques to remove what I hope is an airlock for the last 7 days .
I understand that common rail diesels are supposed to self bleed , but I have cranked this thing for ever with no luck.
Are there any expert diesel mechanics who can advice me on a method that works to remove air from this particular fuel system , I am at the end of the road and worried that I may have a HPFP failure .
Thankyou to anyone who can help.

Regards Silverado25001

**Umai Naa!!** · 02-03-2014, 09:10 PM

These have two electric pumps, if I'm not mistaken. One in the engine bay on the passenger's side of the firewall, and the other is obviously in the tank.

Might be worth testing these to see if they work. The fuses for them are in the plenum at the base of the left side of the front windscreen. It'll be fuses 13 and 14, from memory.

Also check the live data with VCDS, and see if you can pull up an engine speed reading while cranking. Must be above 280rpm to fire up. If it's below 280rpm, check battery voltage while cranking. Could be on it's way out. If you can't get a reading at all, look at G28 engine speed sensor. Have seen a few of these die, and not throw codes.

**silverado25001** · 02-03-2014, 09:22 PM

Thanks Umai Naa!! have checked fuses and relays in plenum , I have limited my cranking to fully charged batteries , will check live data for cranking speed . Yep the weird thing is I am not getting any codes. So if G28 has failed will that cause ecu not to signal injectors to fire ?
Thankyou for some new information.
Regards Silverado25001

**Umai Naa!!** · 02-03-2014, 10:12 PM

Yeah, pretty much. If the ECU doesn't know what the crankshaft is doing, it won't fire the injectors.

**silverado25001** · 02-03-2014, 10:37 PM

Originally Posted by Umai Naa!!

Yeah, pretty much. If the ECU doesn't know what the crankshaft is doing, it won't fire the injectors.

Thanks mate will have a look at G28

**Transporter** · 03-03-2014, 05:54 AM

Originally Posted by silverado25001

Hello everyone , this is my first post and am hoping for some expert help. I have a 06 touareg 3.0 tdi and after changing the fuel filter the car started and ran for about 5 seconds and i havent been able to get it to go since .
I did prime the filter canister with vcds and have been attempting many techniques to remove what I hope is an airlock for the last 7 days .
I understand that common rail diesels are supposed to self bleed , but I have cranked this thing for ever with no luck.
Are there any expert diesel mechanics who can advice me on a method that works to remove air from this particular fuel system , I am at the end of the road and worried that I may have a HPFP failure .
Thankyou to anyone who can help.

Regards Silverado25001

Make sure that the filter canister is sealing and it's not sucking the air in. It's rare that the component would die just at the moment you're changing the fuel filter, don't you think? But, then again I don't know what else have you done to your Touareg. Some maintenance tasks are better left to the mechanics. The under the bonnet of the V6 Touareg, should be the indicator of it.

**Jmac** · 03-03-2014, 03:10 PM

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** · 03-03-2014, 04:31 PM

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