Just a thought. If it's going around you can try turning bolt while pulling delivery unit up, it might pull the nut out of bottom adapter plate if its already loose.
Also here is pdf on testing pump delivery rate if you want to verify that it is definitely pump not delivering, it does require special tools but you can always improvise with whatever is available
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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