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They don't draw much, my camper has the same thing and runs on one old car battery for the races I go to, never run it down while camping.
Another way is to have an air tank in the truck, just a little 5 or 10 gal tire tank, fill it at home then pressurize the water tank w/ 2 psi through a regulator then there will be constant water pressure with no battery drain. This is what I do with a 55 gal drum to refill my camper water tank at races.
-Rob
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'94 F250 XLT 7.3L. Turbo Diesel 4X4 "OFF ROAD" package, X-Cab, 4.10 grears, Now a 5 speed, original IP, just did injectors,"Wallace mod" 3.5" turbo outlet housing and 3.5" DP and straight piped exhaust, 113K on the clock. Repainted it black. Ispro pyro and boost gauges, turned up pump.
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