you'll have no problem using your idea just keep your water source (drum) above
your pump. Annd, DON'T reduce the the intake fitting from the manufacturer's
spec's. I would do two things though. . . 1st. use at least 100gal. tank or two
55gal drums. 2nd if your going to use the pump more than once a week, pay the
xtra and get a good pump. Like cat or admiral, general. NOT home depots. I do
repair on pressure washers ands you can't get rebuild kits for those pumps.
and they don't last if yyyou work em hard.