I wonder if this is a case where the CR HPFP piston has rotated in it's housing and then shredded itself with the swarf ending up all through the fuel lines (including the return back to the fuel tank)?
Some did report this happening here a few months ago.
Resident grumpy old fart
VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS
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