Not heard of it on one of these.
Have seen a case where a wasp had made a nest in a tank vent on a Patrol.
Very rare I’d suggest.
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I had mine in a similar environment to the original post, spending a week thundering around in the bulldust in Karijini. And now I'm back in suburbia, I notice it farts when I close the rear right door.
I'll have a poke around this weekend, but I'll probably take it into my indy for a look-see to be sure.
I imagine an instant noise when closing the door might be this issue, whereas a sound 4-5 seconds after closing will be the suspension system
You are aware that they do hold some pressure right?
I dont hear any noises from mine, but it took forever to fill the tank yesterday, so much so, that 50 odd lts will do.
Its been getting longer an more difficult to fill in recent months, perhaps i should investigate [bigwhistle]