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Old 05-11-2014, 10:37 PM   #1
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Join Date: Aug 2012
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How to prime water pump?

hello to all

i a sure this will be a question that has been asked/answered
a thousand times, but here goes

i bought a 2000 national tropi cal last year, no manuels at all.
i figured out how to blow out the fresh water system with compressed air to winterize.

i was going through the process of filling and sterilizing the fresh water tank with bleach, and it seem in the process of blowing out the system last fall i lost the prime on the pump.

what's the easiest way to reprime the pump? so that i can run the bleach through the water system, the tank is full, and coming out the overflow,
the taps and shower do run in the "city water" mode.
and the pump does run when turned on, but no water at the spigots or shower

so i fugure there must be a vaccume in the system and the pump is not priming

any help would be appreciated


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Old 05-12-2014, 01:06 AM   #2
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Location: Powell River, B.C.
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I think water got left in the pump screen or the pump valves and the housing is cracked and sucking air .
These pumps self prime.
Blowing the lines will not remove the water from the pump, you have to remove the inlet hose and allow the pump to suck RV anti freeze from a container. Or remove the pump for the winter and store inside.
Repair parts are available , so you don't have to buy a complete pump.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 05-12-2014, 05:05 AM   #3
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Location: Phx, Arid~zona
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I'm pretty sure our pumps are self priming. Never had a problem with mine not pumping.

2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
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Old 05-12-2014, 05:49 AM   #4
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Hopefully when you blew it out you opened the pump inlet strainer and drained it.. IF NOT, then it is possible the inlet strainer housing is broken (Look at it, you will be able to tell)

Two ways to prime the pump.

1: Partially fill the fresh water tank and turn on pump. it should self prime, OPEN a faucet or two to let it blow air out.. It will pump air.

2: Fill the fresh tank till the water level is HIGHER than the pump.. then see 1: (This will make it prime faster.

I have only had to prime mine one time And that was mostly because I was in a hurry and only had like 10 gallons in the tank.
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Old 05-13-2014, 05:12 PM   #5
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pump prime

hello to all and thanks for the responses

long story short, evidently i didn't have one of the valves
positioned correctly, (the one labeled inlet to pump)
through trial and error i finaly got it to the correct position
started getting water through the outside shower, then went through
each faucet, shower, and toilet, untill the air was bled from the
i think were back in business

that's the problem with not getting any manuels, everything is pretty much trial and error

we live outside of atlanta georgia, and from what i read, and saw online with the average temperature here, the general concensus was that blowing the system out should pretty much do the job in this part of the country,
i also went the additional yard and put anti freeze down all the traps, sinks, shower, toiled, and about a gallon into each holding tank

glad i got it working, as i would have no idea how to even get to the
pump to repair or replace it

thanks to all

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Old 05-13-2014, 06:44 PM   #6
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Glad your fixed up. But I hope you didn't put the RV A/F in the fresh water tank, once drained it will be fine . R/V , A/F in the fresh tank takes forever to clean so it doesn't taste.

PS. Finding the pump is a need to know item. You need to know ! Track it down by the noise , there may be a panel to remove , but find it.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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water, water pump

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