hi there
i believe you can yes, because it uses standard old traditional distributor pump, unlike modern common rail diesels.
the only thing i would advise is changing the fuel filter more regularly than what ford recommend. say every 6000 miles would suffice. the reason i say this is - bio diesel - will over time leave deposits on end of injector nozzles etc. if u change filter regular - this will help to prevent this.
the other thing i would advise is - using a tank of normal diesel every 4th tank or so, because this will help blast out that gunk also.
its all preventative. - if you just carried on using bio diesel full time - eventually - you would probably be forking out on injector cleans or pump renewals.
hope this helps
please accept if you are happy with the advice.
regards
jagmanuk fordman uk