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Shur Flo pumps run but no water

Old 05-26-2007, 09:35 AM
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Default Shur Flo pumps run but no water

The Shur Flo Fresh Water AND baitwell pumps run (I can hear them) but produce no water. For fresh water, the tank is full, valves are open. For baitwell, valves are open.

What am I missing,

TIA,

Harry J
Old 05-26-2007, 10:10 AM
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Default Re: Shur Flo pumps run but no water

Easiest to hardest

1)Double check that all valves are open. Pumps should be self priming.
2)Check the filters to make sure not clogged. Should be between tank/thru hull and pump. They prob. have some sort of clear top. If it looks dirty in there, spin off the top, remove internal screen, clean and reassemble. Most are plastic so be gentle and do not overtighten.
3)Remove inlet plumbing to pump and see if you get water coming out of supply line.
4)Remove outlet side of pump and blow air thru line(if you can-may not be feasible on complicated Fresh Water plumbing) to make sure that side is not clogged. Alternate would be to just remove outlet sides of pump, flip on pump and see if it is pumping water there (Have bucket handy)
5)Examine pump impellars/diaphram to make sure they are not worn/damaged.

Hopefully it's just clogged/dirty inline strainer (#2) When was the last time serviced?
Old 05-26-2007, 10:32 AM
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Default Re: Shur Flo pumps run but no water

Thanks, Chris - boat is brand new; I'm wondering if there are bits of fiberglass or something similar.

Would there be a strainer for the fresh water tank?

best,

Harry J
Old 05-26-2007, 11:52 AM
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Default Re: Shur Flo pumps run but no water

Hmmm, a little different point of view then.

Still double check that all valves are open. Trace the water supply lines from source to the pump to make sure. Should only be one, but could be more. If ball valves, try with the handles in both positions. The handles can be oriented in different ways and you could think its open when it is closed.

Check to see that the supply filters are tight (again but not too tight) and there are no cracks in it to allow air to be sucked into the system.

Check to see that all connections are tight.

Check to see that the pumps were wired correctly-positive supply to positive terminals. Some pumps can spin in reverse if the polarity is reversed. Groco's can; not sure about Shur-flow; too many models. Shouldn't really matter on an diaphram pump but will on an impellar pump.

Look for the arrow on the pump water housing to make sure that the flow direction indicated on the pump is the same as the plumbing system.

Re strainer question: There should be a strainer for all water lines between the supply and the pump in order to protect the pump from any debris that finds its way into the water - fresh or otherwise. On the pumps supplied by a thru-hull you may not find a strainer on the inside of the boat because the man. went with only one on the underside of the hull which covers the thru hull. I would be surprised if there was not one between the fresh water tank/city water hookup and the water pump - Not saying all man's put one in, but its a good practice/sign of better design than not having one.

With a new boat, anything is possible. But I doubt its fiberglass particles or the like; but that's not impossible. It just wouldn't be the first thing I would think of checking. Some of the pumps are supplied with little blue caps that fit inside the plumbing connections to keep dirt and debris out of them during man & shipping, etc. It's even possible, but I think unlikely, that the installer forgot to remove them before when connecting the supply lines/discharge lines. Whatever you do, do NOT run the pumps for any length of time with no water flow if they have impellars. Not sure, but I think shurflo uses impellars on washdowns but diaphrams on fresh water pumps. Diaphrams are not as prone to damage when "run dry".

If above doesn't work, or you don't want to go thru all this, consider kicking it back to the deal. But he's prob very busy right now and I suspect you want to use the boat now. Good luck-its probably something really stupid.
Old 05-26-2007, 02:52 PM
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Default RE: Shur Flo pumps run but no water

take the hose off the outflow end. turn pump on. that should prime it. same thing happens to mine, supposed to be self priming, but air bubbles get trapped.
Old 05-26-2007, 03:57 PM
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Default RE: Shur Flo pumps run but no water

Thanks, Chris & Brad. Just back from the boat, check the strainer, seemed OK. I'll check some of the other options tonight or tomorrow. Best,

Harry J
Old 05-27-2007, 12:49 AM
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Default Re: Shur Flo pumps run but no water

Make sure both of the cut off valves are open in the Live well and right where your washdown hose connects....


John
Old 05-27-2007, 03:50 AM
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Default Re: Shur Flo pumps run but no water

If the pumps are above the waterline (or fresh water tank) its most likely priming. If I don't run a little with the suction valves open and let the high speed pickups get some water flowing, my Shurflo pumps won't prime on either livewell. The pumps are self-priming but only produce a little bit of lift so they need some assistance if they are completely dry at the suction end. If you pull your boat out of the water with the livewell pump valves open then they will drain and you will need to prime them next time you go out, but the fresh water washdown should stay primed. If there's air in-leakage on the suction of any of the pumps they will have difficulty priming, so check the hoseclamps.
Old 05-27-2007, 11:23 AM
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Default RE: Shur Flo pumps run but no water

Hi Brad,

Tried taking the outflow end of & running them to prime - no love.

Yes, the pumps are above the waterline - I'll chk the clamps. Auburn, The boat stays on my mooring.

Still trying!

Thanks Harry J
Old 05-27-2007, 12:10 PM
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Default RE: Shur Flo pumps run but no water

When my boat was new I had a problem with the raw water washdown, didn't prime well and didn't produce much flow. I could see air bubbles in the filter, so somewhere in the 10" between the filter and seacock I had air in-leakage. Turns out the manufacturer used a black hose with internal spiral ribs, which prevented the hoseclamp from sealing all the way around the pump discharge port. Replaced it with that Ace Hardware clear hose with white internal fabric reinforcement, which is smooth on the inside. No air, works like a champ.
Old 05-28-2007, 08:10 AM
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Default RE: Shur Flo pumps run but no water

Do you have a salt water wash and if so, is it on the same high speed as your bait well?? I can run my washdown to prime mine through the single thru-hull that everything "T's" into. Some boats will have more than one pick up, though, but this still may work.

My trick (works for me) is to run the washdown and place the nozzle of the washdown hose into the baitwell and squeeze the nozzle wide open shooting a pressurized stream of water through the baitwell pump intake with all pumps on and it primes immediately..

Will water run through the pump and into the baitwell while underway? If not, a valve is off (crossways) or the pump is seriousy clogged.
Old 05-28-2007, 08:22 AM
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Default Re: Shur Flo pumps run but no water

Some of the sure-flo pumps are magnetic field driven and they just dont line up right and break the magnetic field easy when strained by the inflo of water. I believe it is the Sentry model that has that problem. If this is the case get those things out of there and put some Rules in there.
Old 05-28-2007, 08:34 AM
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Default Re: Shur Flo pumps run but no water

Some boats have an additional shut off valve up high in the live well area.
If the boat has been bottom painted make sure they didn't plug the intake with paint.
Old 05-28-2007, 09:22 AM
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Default Re: Shur Flo pumps run but no water

the pump and all inlet related fittings need to be below the water line [as low as possible] for trouble free operation.
Old 05-28-2007, 08:49 PM
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Default Re: Shur Flo pumps run but no water - 50% fixed

Hi guys,

OK, got the raw water pump going. The pump serves both the wash down & baitwell, so I hooked up a hose to the washdown and hung it low. *That* got the pump going - for the baitwell, too.

Still no love for the fresh water. Checked the fittings, all tight. Tank is full. Ran the pump with the outflow end unplugged - nothing (pump does run). Detached line from tank to pump - just a couple of drips. I tried to run some fresh water down the hand shower hose in an attempt to prime - nada.

Pretty strange (to me). I can tell you I'll be darn careful to not run that fresh water tank dry again.

Thanks for your help,

Harry J
Old 05-30-2007, 07:21 PM
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Default Re: Shur Flo pumps run but no water - all fixed!

Got it!

When I first had the boat, the forward in-floor storage was filled with water. The drain wouldn't, um, drain. So I took my manual push/pull bilge pump, put the end in the drain, push, pull, voila - drain is clear.

This time, I disconnected the fitting connecting the tube from the tank to the pump, put the end of the manual pump line into the tube, push and bingo - water gushed and I'm good to go.

Thanks to all who assisted,

Harry J

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