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Your pump will siphon water from a tank without positive pressure on the supply line, BUT it will not draw water from the "START" unless the main water supply is HIGHER the pump, or the pump & line are primed. <i>Best way to understand this is; remember that water seeks it's own level, the line you run to your machine won't fill with water at the pumphead height until the water level in your tank has reached at least that height. Once it reaches that height the water will naturally flow into the pump & thus prime when started.</i> Once the machine is running & pumping it will draw water lower than the pump height
When setting up your supply lines from a tank as such, you can't use simple garden hose or the like. Plain type hose will collapse from the draw the pump will put on it, remember there is no positive pressure on the line to keep it rigid. <i>This collapse may not occur when regular hose is NEW, but rest assured it will eventually break it down & collapse it</i> Also, because of no positive pressure, you will need to use larger than normal lines to maintain adequate FLOW, GPM. Where you say you used a 3/4 hose, if it's more than a foot long I'd probably say use a 1 inch, & a reinforced 1 inch at that. Running hard PVC lines is the best bet, if it's a permanent setup run 1 1/4" all the way to your pump.
And yeah, put a filter on the lines & a ballvalve too. 20 micron stainless steel screen is my preference. Position the ballvalve in line so you can shut the water off when you clean out your filter.
Cody</font>