Mike Rapoport wrote:
"Newps" wrote in message
...

Got a new pressure washer today and I want to bring it to the airport to
wash the plane. It needs 20 psi to work properly. If I put a 100 gallon
water tank in my truck and fed the pressure washer with a standard 5/8"
garden hose and a 3 foot drop to the pressure washer on the ground would
that give me 20 psi?


The answer is no you will not get 20psi. However, I have a 13hp Karcher
pressure washer that I bought at Costco and I have found that you don't need
much pressure to the inlet side for it to work. Try to get the largest
possible hose and fittings. You need an inlet that flows at least as much
as the pressure washer is rated for. The goal is to have enough pressure
that the pump doesn't cavitate. It doesn't take 20psi.

I can get a bigger hose but the inlet fitting is a standard garden hose
fitting.