Bongo Fury

Hello all
Can anyone give me a diagram of how the filler cap is assembled. Each time I fill up my petrol bongo I always get a hiss upon removing the filler cap. The van appears to run ok, but if i have an ssue with fuel starvation of a small extent it would be good to cure it.
I have taken the cap apart and all seems ok, but want to check my reassemble was correct.
Thanks in advance

That's pretty normal as the tanks can be different from ambient pressure - its the amount that's critical!
This is the V6 cap;

Thanks G8dhe
That's how I reassembled it. I get quite a noticable hiss upon removal, yet I always read their should be no hiss upon removal.

No I think its confusion with the diesel version, in a diesel the hiss is caused by vacuum and should be fairly small hence the spring araagment is a lot different. The internal vacuum pulls the outlet cap down against the spring, to ensure that the tank doesn't collapse and that fumes are not emitted;


Whilst in a petrol its caused by excess pressure of the returned fuel & vapor to the tank and also works in the other direction to prevent tank collapse

Thanks for the clarity, this will ease my mind...