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As far as I'm aware when the immobilizer kicks in it stops the fuel, so if the immobilizer is stopping fuel then you won't get any fuel pressure and therefore no pressure at the filter. If it were me I think I'd concentrate on the immobilizer fault. Hope that helps. Good luck Stu

If you have a JAX automatic gearbox then look here at where the crank sensor is: http://www.audi-sport.net/xf/threads/engine-speed-sender-crank-sensor-on-automatic-jax-gearbox.327669/#post-3020277 If it's not an auto then I think it's just above the drive shaft on the left hand side.

I did all this on my 3.0 tdi b7 when it wasn't working. Glow plug relay is under ECU, if it's not swimming in water then it's probably ok. I would definitely replace the crank sensor/engine speed sender and maybe the cam sender it the crank sensor doesn't fix it. Good luck!

I've not had a b6 and never had to change a fuel pump, I've only taken one out of my b7 3.0 tdi cab. to completely drain the fuel tank so I can't help with replacement options, sorry. Sounds silly but have you undone the small bolt on the side of the fuel filter (get a cloth and wear goggles) to...

If you are thinking of taking the fuel pump out make sure your tank is less than half full and mop up the diesel that you spill - it likes to eat the sound proofing under the rear seat (I had a piece of sticky disolved soundproofing stuck to the front of my shoe and walked it into the house)

If i remember correctly you should be able to hear the pump kicking in when you turn in ignition on if it's working. If the starting is intermittent then it's more likely to be one of the hall sensors imo. What ever it is I hope you get it sorted quickly, my car's being a pain in the butt.

It may be the crank sensor / engine speed sender (g28) or cam shift position sensor (g40). Both tell the ECU when to inject the fuel, if either of them are faulty it won't fire. Sometimes its an intermittent fault, it'll fire and then die again? Or it could be something else. Definitely need to...