We bought a Scamp 13 this year. I read the manual and did the following:
1) Opened the sink and shower faucets.
2) Emptied the Fresh Water tank
3) Removed the hot water heater drain plug to empty the hot water heater. Replaced the plug.
4) Put 1.5 gal of RV antifreeze into the fresh water tank
5) Closed all the faucets
6) Turned on the demand pump. Pump kept running so I opened the sink cold water faucet until pink stuff came out. Then opened up the show cold water until pink stuff started coming out. This seemed to use most of the 1.5 gal so I turned off the pump, put another .25 gal into the fresh water tank, turned on the pump and flushed the toilet until I got pink stuff coming out. Then I turned off the demand pump (which was still pumping).
7) Poured RV antifreeze down the sink, shower and toilet. Turned on the shower demand pump for a bit.
8) Pushed in the little white piece behind the screen in the city water line, which let water out followed by a little pink antifreeze.
9) Drained the black and gray tanks.
I am wondering why the demand pump keep pumping. I would have thought it would stop by itself. Should this be happening?
The pump is not good at pumping air so when it ran out of pink stuff and sucked air it could not quite make enough pressure to shut off the pressure switch. This is normal and it sounds like you did well with getting out the water. and with filling the "P" trap. We also run enough Pink stuff possibly .5 gal in the shower drain with the pump running that we are sure its drain/plumbing and pump are also protected
2019 Scamp 13 standard