Balaton,
I've been told by an ex Fokker guy they delivered only one aicraft fitted with fuel bladers in the fwd cargo hold.
It was a Fokker 70 destined for an african airforce, which one I cannot recall.
He also told me the aircraft was likely to run out off engine oil before it would run out off fuel, due to the amount of oil the RR-Tay consumes/leaks.
IFIX