Hi Tony, how old is it, like many things they can wear out and it may require replacement, I am not aware of any of the workings of the unit being serviceable.
Ours is noisey every time the water is used. There is an adjustment screw on the outlet which I sometimes adjust and the noise goes away. Always comes back some time later. Have now learned to live with it.
Hi, If you are not intending drinking the water from the pump, I'd give the pump a tiny squirt of WD40 to see if it will lubricate the bearing....that's all it could be.
I don't know this type of pump, but UK waterpump usually are pressure pumps, hence mounted outside of the watertank (Mine is not pressurized and just hanging in the tank).
If so check how it is mounted. Probably on a panel, which amplifies the noise especially if it is a thin panel (like a guitar or violin and similar instruments, the panels and box shape amplify the sound of the strings). Try to mount it on a piece of rubber or even better put rubber rings in between at the base (whre the screws are driven in). This should prevent the vibrations to be passed on to the panel and should take away the acoustic amplifying effect.
If your pump is hanging in the tank, pull it up a bit so that it hangs free and will not touch the bottom or sides of the tank. These have a similar amplifying effect.
The panel probably is rather thin and it is a box (double wall with insulation in between). Giving the pump a more substantial basis/underground would help. Tightening the screws may help, as if these are too loose, allow the pump to vibrate (apart of course from the pump motor en wheel).
Replacing the rubber mounting point by a rubber 'mat' (e.g. a piece of neoprene, maybe you have some old worn out neoprene socks or surfing shoes) may also help as this gives less room for movement than just rubber mounting points.
Or go the other way take a much more heavy and massive wooden block to mount it on (with or without rubber mountings, as long as the wooden base is not sensitive for the frequency of movements the pump). Anything to prevent passing the vibrations on to the van itself.
But first loosen the pumnp and than try it. Holding it in your hand while someone else taps water should give you a clue. If now silent you know where to find the solution.
By the way, on my attick there is a ventilator for the house. Also properly on rubber mounting and yes, on a wooden panel. This made noise and I solved the problem at that moment by tightening the screws (now there is a new one, the old one is worn out), giving it less of opportunity to tremble or move otherwise. It became nicely silent.
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Topic: Noisy 12v Water Pump
