Will a 6kva generator run a 3hp compressor?

In Australia @ 240v NO.

Well not from a 6.5Kva scorpion 10hp diesel gen. 100% overload short term, don't think so. 6.5Kva is about 5000w. 3hp compressor near full load is just over 4000w. But needs around 10,000 12,000 watts to start, maybe even more in certain conditions.

It may start with a quality genset of same size but I would doubt it.