What's that Lassie? You say that Steve B fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 20 Sep 2010 22:03:02 -0700:

If you are using a gravity feed, the water source would have to be
57.11060948 feet higher than the power washer to provide 40 psig to the
washer, and that is allowing for the 14.7 psi for normal atmospheric
pressure.

Do you need 40psi? Is that what the pump mfg. says, or is that what
you have from the garden hose?

I would think that as long as you don't suck air, or cavitate, you
could be at 0 psi.
--

Dan H.
northshore MA.