I think the WVO may have coated your fuel system with wax. This does happen occasionally when mixing diesel fuel with WVO. You should have told us about your WVO use in the previous thread. I'd try the StarTron fuel additive which should be able to dissolve this kind of gunk if it's present. Bosch diesel injection pumps are not known for frequent failures so I'd replace the pump only as a last resort.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL