It would be helpful when asking questions to include the year AND MODEL of your Fun Finder.
I fill my fresh water tank until it squirts out the little air bleed hole just above where the water hose hooks in. The spec sheet for your model unit will state the capacity of your fresh water tank.
Does your unit have a black water flush? Some do & some don't. You should not drain your black water tank until nearly full so all the solids and toilet paper flush out. Also, be sure you use the toilet tissue made special for camper .... NOT the same as you use at home.
When draining your black water, let it run until no more comes out ... then drain your grey water tank until no more comes out. The grey water will help flush the black effluent from your drain hose so it's 'cleaner.' Once emptied, if the black water tank shows 1/3 full yet, could be something is stuck to the sensor in the tank ...... or you need to wait a little longer then check again. The black water flush is handy to help clean the inside of the tank/sensors.
The indicator light panel for the fresh water, grey water, black water tanks are an approximation only .... not an exact amount indicator. Hint: After I got my camper, I went underneath it and made sure the screws that secured the wires to the tanks were tight to make a good connection ~ several were not all that tight.
The water pump only pumps water as long as it's available in the fresh water tank and it will not pump your hot water tank dry..... however I would turn off the water heater heating once the faucet fails to pump hot water.
HOpe this helps.
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2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.
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