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Old 08-08-2012, 07:43 PM   #1
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Location: Broken Arrow, OK
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Filling Fresh Water Tank

We finally purchased a water tank for potable water, now how to get it into fresh water tank? Can we use our on board water pump and pump through the anti freeze or city outlet to fill it or will we need an external marine pump?

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Old 08-08-2012, 08:09 PM   #2
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No the water pump aux suction only pumps to the system not the tank. If you can gravitate with a hose? or use a transfer pump.

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Old 08-08-2012, 08:28 PM   #3
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I bought this transfer pump a few weeks ago and have had good luck with it so far. Wayne PC1 12-Volt 350 GPH Portable Battery-Powered Transfer Water Pump, Bronze: Home Improvement

This one is DC so i just hook it up to the trailer battery.

Made getting water from a 65 gal storage tank to the trailer very nice and easy. Takes about 5 to 10 minutes to get it filled versus 45+ with trying to use gravity.
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Old 08-08-2012, 08:47 PM   #4
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Keep it in the rear of your truck. You may need to elevate it on a milk create. Run a hose to the camper fill and let gravity drain it for you.
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Old 08-09-2012, 07:39 AM   #5
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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.

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