Hi Guys i wanted to know how long can i run my boat motor with just the garden hose attached to the inlet on the back of the boat? Is it safe? My buddy has a system that he dissconnects the input to the thermostat and hooks up this hose system that he made up which connects to a regular hose and he says it works fine. any suggestions. Its a Jet drive is there a impeller in the jet drive housing? will that be damage if run without water too.