When was the fuel filter last changed? If no record change it as soon as possible.
Might also be an idea to remove the sender unit from the tank and check for algae/gunk around the nylon filter gause, it won't cost you anything other than your time.
Failing that you could have a leak-back test carried out on the injectors by a diesel specialist.
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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