Anyone know anything about big pressure washers?

[StevoS3]

I've got a Graco 3340 Pressure washer for my work but I have a job coming up and moving from spot to spot without a main water source witch is what I usually run from.

I need to know if I can run my pressure washer out of a 300L tank of water or does it need to be fed from an outdoor tap or similar?

 

[Turkster]

i cant see why it wont suck it up at the same rate, best to try a wet run from a bucket 1st,