08-09-2012, 07:39 AM
Join Date: Mar 2008
Location: Louisville, KY
This question comes up every once in a while.
You "could" use your existing water pump but it would require lots
of extra plumbing and fittings and valves and might be a PIA.
I used to think the easy way would be to purchase another RV water
pump and rig it for the specific task of moving water from the external
tank to your onboard tank but don't think it's the best bet.
Those RV pumps are built for pressure. They can easily generate 40-60 PSI
or more and are usually rated around 3 GPM. That's only 180 GPH.
Probably more at very low pressure but still not great for moving
an entire tank of water.
I like Jason's idea of the transfer pump from Amazon.
It's rated 350 GPH which is nearly twice what you'd get from an RV pump.
I have some experience with marine bilge pumps and don't really
think that's your best bet.
The low end marine bilge pumps are made to run submerged.
Many of those aren't self priming and the ones that are probably are not
any more cost effective than the one from Amazon.
Followup-- IF your water tank has a large opening in the top-
like 6" or so you could use a drop in bilge pump and a hose.
It would save you maybe $20 over the Amazon pump.
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch
Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32, 2020-35