Technical I think my Panda is turning into a cow!?

[Lord Azrael]

My Panda MultiJet seems to have started 'mooing' whilst it's parked up outside the house. I was just standing outside today and it did it a few times. The engine's not switched on, the key isn't even in it and then a strange 'moo' noise and then silence again.
I actually thought it might just be the bulls in the field but it definately seems to be the car.
Any thoughts? I've not been able to track it down to anywhere specific it's coming from and it does seem a little random

 

[Jai]

https://www.fiatforum.com/panda-new/110202-new-panda-variant-way.html

 

[HP]

Quite possibly venting pressure from the fuel tank as it heats up. My Cinquecentos used to do this!

 

[Lord Azrael]

That picture is awesome! I'm not sure I'd actually want to drive it around, but it's good for a laugh.

Yes, could certainly be venting I suppose. I have taken it out for a run today and the temperature up here in North Scotland has been over 30 C "!!!

 

[ivantate]

Ours did this for a while about a year ago. It is do with the fuel tank as the noise comes from the back near the filler. I am not sure if it is pressure or a vacuum, obvious a vacuum isnt good as is may cause fuel starvation.
It didnt seem to cause any ill effects and also doesnt do it any more.

 

[HP]

There is a two way valve on a breather near there. It will allow air in if excess vacuum forms or fuel vapour out for excess pressure. It prevents any harm coming to the fuel tank and attached piping.

 

[ivantate]

I wouldnt have expected to carry on equalising the pressure after the car stopped though, and not more than once.

 

[Schwenck]

It's not the kind of 'mooing' you get when the car rolls a tiny amount on the handbrake is it?

 

[james2609]

I think your car needs milking. Take to the nearest dealer... I mean Dairy Farm!

 

[HP]

I wouldnt have expected to carry on equalising the pressure after the car stopped though, and not more than once.

If left in the warm, it can produce quite a lot of fuel vapour on top of the liquid in the tank.