I've got a 300-gallon water tank on an old trailer. I was thinking of putting a gas-powered water pump on it so I could use it around the farm for putting out fires. Nothing too serious, just something to have on hand during bonfires, as well as some cheap insurance in case there was ever a grass fire.For my water pump, I was thinking of getting an older “trash pump” because it looks like I can pick one up relatively cheaply on Ebay. 5 or 6 HP, 2-inch inlet and outlet. I figure I’d use 1-inch hose on the outlet with a nozzle to control the flow. Some things I'm wondering though: Will I be able to get enough pressure out of a trash pump to make this work? From looking through catalogs, I get the impression that trash pumps are meant for high volume, low-pressure operations. With a nozzle on the end, is there going to be enough pressure to throw the water a decent distance? Also, since there's a nozzle on the end of the hose that would be turned on and off, there's going to be some backpressure on the pump. Will this affect the pump? Since trash pumps are designed for more or less continuous operation, am I liable to screw-up the pump turning the nozzle on and off? A picture of a pump I was looking at: 
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