GPM WATER INLET

Thanks for all your input guys.

Depending on the initial pressure and length, a typical 1/2" garden hose will provide something like 5-10 gpm. The problem will be the city water inlet and if you look inside it, the check valve which will be rather restrictive. Maybe 2-3 gpm?? I actually removed the check valve in ours, enlarged the opening and installed a new and larger check valve inside to get better flow.

All you need is a submersible "aquarium/fountain" pump like this:

1.75 gal / min pump

If need be, you can power it off 120v with one of these:

1.25a converter

Or, if you're in a hurry, one of these:

3/4" barb bilge pump

Head / hose resistance will drop the overall flow.

path1 wrote:
Don't know what the rush is??? Be careful of your vent tube, most vent tubes are just vinyl hose and a little plastic barbed fitting with a hose clamp around it. Mine fell off on time and it was a son of a gun to get back on because of no room to get hose clamp tight. After that I don't put a lot of pressure when (re-filling) or better stated displacing air inside the tank with water.

I picked up one of these.

http://www.harborfreight.com/12-volt-marine-utility-water-pump-94639.html


I thought is might be good for maybe 1 or 2 seasons. That was probably 5 years ago. I'm surprised it still works for the price I paid for it.
.

I hooked a pump like this up to a clean sealed plastic 55 gal drum and it worked well for 3-4 years before it quit. The experiment showed me it was well worth it so I replaced the pump with similar unit that could act as a replacement pump. I can also hose into the city water supply and use the water directly from the drum.

Don't know what the rush is??? Be careful of your vent tube, most vent tubes are just vinyl hose and a little plastic barbed fitting with a hose clamp around it. Mine fell off on time and it was a son of a gun to get back on because of no room to get hose clamp tight. After that I don't put a lot of pressure when (re-filling) or better stated displacing air inside the tank with water.

I picked up one of these.

http://www.harborfreight.com/12-volt-marine-utility-water-pump-94639.html


I thought is might be good for maybe 1 or 2 seasons. That was probably 5 years ago. I'm surprised it still works for the price I paid for it.

I've re-filled by running campground faucet into bucket and then hose from pump into bucket then transfer to RV.

I've re-filled by using 5 gallon water bottles from store then use pump to transfer to rv.

etc, etc

Then do come with sort of short wires, maybe 4 or 5 feet, battery cables helped me out couple of times.

I'd buy again.

pumps are rated in gph / gpm and by pressure.
Sump pumps deliver high volume at low pressure. They wont do much through a garden hose. Little pressure, you see?
For a transfer pump find one that gives a lower gpm with a higher pressure.

I would get an RV water pump made for potable water. Get same as you have to double as a spare.

Why the rush? Does it matter if it takes 20 minutes to transfer 50 gallons?

RV waterpump on Amazon