Sounds like a decent deal, considering the age of your FM. At 48k, the Santa Fe still has life left in it. Typically fuel system problems don't appear until after 100k, and possibly not until after 150k.
If you're buying this as a "meantime" car, while waiting to trade up to brand new, go ahead. But if you're angling towards saving up for something new, you could keep your Pajero for a while longer and do just that.
Have you started replacing items on the Pajero yet? AC Compressor? Alternator? If you haven't, just yet, that might be a good reason to trade to something newer. Less hassle.