Quote:
Originally Posted by daytonatrbo
So the filter will prime itself without intervention from DIS? Good to know.
Add the discussion about the PCV/catch can to those other 2 threads and it's like the 35d bible as far as I'm concerned.
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WRONG - The fuel filter itself will not prime, even the OP's post on that thread says he left key in on position for 10-20 seconds and it still started up dry. Read through that whole thread, the pump does not prime itself.
This is a common misconception from doing gasoline engines which do prime their fuel filters when key is in position 2. I have not met a common rail diesel (VW or BMW for that matter) that does this without using a service function software to prime the pump after a filter change.
When the car cranks for 10-15 seconds after the change, it is because it is running the HPFP dry which is terrible for the life of the pump and can lead to total failure.
If you don't want to risk damage you have to prime via DIS or similar tool, or "hotwire" the pump to run and prime itself using the instructions on page 5 of that thread, but that also entails removing seats and jumping wires -