Water pump thumping noise

When you are in van parks & the noise happens are you connected to a mains pressure tap or are you just using water out of your onboard tanks with no connection to the mains

Regards Don

I'm guessing that maybe the water is not filling the pump... i.e. it's pumping air at times. Maybe between use the water drains back past the pump and it has to suck air and water for a while.

Does it get better once the water flow has started?

Can you get to the intake pipe to check out if it is full beside the pump?

Leanne,
Sounds like good ol' cavitation to me. Usually caused by air getting into the system. Maybe there is a small leak letting in air or maybe air from inside the tank is siphoning back into the lines/pump. Assuming you are using storage tank water.
If not, maybe fitting a anti-hammer washer to the tap might solve the problem if it's mains pressure water you are using.
So many variables here..sorry!

Cheers, Matt

Thanks for the quick replies.

The thumping noise has happened while connected to mains pressure tap and while using tank from water (while free camping).

My husband will check to see if air is getting in somewhere as that sounds like a possible cause.

Thanks again.

Leanne

Not sure what,if any damage it may have caused to the pump but if it is working ok i wouldn't be to worried

One thing i have noticed is on our 2004 heritage the pump actually works when turned off when you flush the toilet while connected to the mains

If yours is the same if the tanks get empty it will suck air into the toilet flush water & you will get strange noises when you flush (if your toilet is electric flush)

If this happens put some water in the tanks,turn the mains off,turn the pump on & turn on a tap inside the van until the air is purged out & then turn the pump off ,the mains back on & it should have fixed the problem when you flush the toilet

Also something to be aware of is if you have two tanks you should have taps in the supply lines before the point where the two supply hoses T into the one inlet hose to the pump & you should only have one supply tap open at a time so you don't suck air from a empty tank (if one tank is empty & the other has water in it) into the pump supply line

Godd luck

Regards Don