TDI Air in Line. Where do I start? ALH Engine.
Describes some of the first things to check to find the cause of air in the fuel lines for the VW TDI with ALH engine code in the MKIV MK4 chassis. tdiclub.com is a good source for information about this. The best way to search tdiclub forums is to use Google. Try terms like TDI ALH air in fuel o-ring or TDI ALH thermal T or TDI ALH fuel pickup.

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