yes, but for how long? and what kind of maintenance issues are you likely to encounter?
if the veggie is well filtered it will certainly burn in the engine, however you will likely have all sorts of problems with all the rubber parts, hoses, orings, pump seals, lift pump diaphram (maybe) to deal with.
then there will be an issue with piston rings getting gummed up
and then unburned or partially burned veggie getting into the lube oil, polymerizing into a goop that is hard on lower end components
so, if you change out some rubber parts, which likely need changing anyway due to age, and if you change oil a bit more frequently, and set it up to start and shutdown on dino diesel, and maybe switch to and fro during the drive just to keep things as clean as possible, you can probably get by using it.
you probably will have to heat the veggie for it to flow and make it through the system in cooler weather and definitely in cold weather.
short answer, is yes it can be done, the reality is a bit more detailed to do it right.
bob g