Strange fresh water pump problem

[Truro Ex Pat]

Hi Guys I was wondering if anyone has come across a similar problem?
The fresh water pump works fine with a little time delay when turning tap on in the boat but on the flybridge you turn the tap on and get no water unless you turn a tap on down in the boat, to me it seems like a pressure problem and the pump does not realise that the pressure has dropped and the pump dose not kick in?

Pump seems fine every where else its just flybridge, took everything a part and all seems ok?
Its a Whale FW5084(B) the factory is closed for holidays typical!

 

[markc]

On the FB, after you have opened a tap below to trigger the pump, does it still run when that tap is closed (and FB still open)? If so, will opening & closing the FB tap once things have got going work, or does it fail immediately? Maybe there is a sticky non-return valve somewhere on the FB run?

 

[Truro Ex Pat]

caked for non return valve and can't see one?
Once it starts running it keeps going its just after an initial burst of water and then stops completely unless you turn a tap on down in the boat, there is no adjustment on it at all that I can see its factory set pump so looks like another pump to me but will call factory next week .

 

[jrudge]

I would imagine that there is not enough of a head in the accumulator to get water out the tap. Pump up the accumulator and I wound guess it will work fine

 

[Portofino]

Accumulator issues .
First check for a leak somewhere ,I mean in the plumbing in general ,a dribble is loosing the pressure that once was enough to give enough head for the FB .
FB is the 1st casualty .
Can you hear the pump when it's running ?
You know there's a leak when the pump comes on on it's own ,to top up the accumulator then stops .
Prob is on a large boat with multiple outlets and folk all over the place initially you think some one,s turned a tap on .

Push fits don,t we all love em on a boat !!
Start in the ER trace all the pipes ,lift up floor panals ,
I found one a dribble under a bathroom cabinet ,a solinoid for the eletric flush on a bog .
Another one the bathing platform shower lead had ,had a pull and started to weep -buried deep inside the transome .Found it by removing the lining of a locker in the crew cabin ,after noticing a damp /wet area in the bilge near the rudder boxes -traced it coming from up high .
Because they dribble pressure is lost -eventfully the pumps detects this via low acculmator P and comes on on it's own .
How -ever if you turned a tap on normally before the acculmator had charged up ,then momentary low pressure -- in your case it can,t beat the FB head .
Suspect that's what you have going on here.

 

[VicS]

Hi Guys I was wondering if anyone has come across a similar problem?
The fresh water pump works fine with a little time delay when turning tap on in the boat but on the flybridge you turn the tap on and get no water unless you turn a tap on down in the boat, to me it seems like a pressure problem and the pump does not realise that the pressure has dropped and the pump dose not kick in?

Pump seems fine every where else its just flybridge, took everything a part and all seems ok?
Its a Whale FW5084(B) the factory is closed for holidays typical!

Clearly the static head pressure of the flybridge tap is higher than the "cut in" pressure of the pump.

I cannot find any technical details for the pump but presumably it once all worked properly so is not a question of incorrect specification but one of an ailing pressure switch

If the pressure switch setting is truly unadjustable then I guess a new pressure switch is needed but check the specified pump cut in pressure with the static head pressure of the flybridge tap.