A friend has a VW Touareg with the diesel. I think it uses the same HP pump.
The pump is a known and common failure point with the results you have. The roller gets cock-eyed and things come apart. That pump might be considered a "wear" item. Maybe some lube added to the fuel will help as a preventative measure.
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Sold: 1989 3.2 coupe, 112k miles
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