tech ques...probably a daft one!

hi all

i thought i had a blow on the front pipe of my hiace camper, and got underneath to have a look.
it turns out the blowing sound is actually coming from a plastic bottle, located next to what i think it the air filter (didn't undo to verify as i was in a rush).
the plastic bottle in question sits right underneath the drivers seat, down by the sill near the drivers front wheel.
the bottle is cracked, making a blowing sound.
as standard the bottle has two breathers in it, with two rubber breathers.
question is, what is this bottle for???
i'm guessing it something to do with air flow, but can't think for the life of me what it is!

thanks

nick

Its a 'helmholtz resonator'.....don't know why its there...something about balancing air pressure or something...don't really understand myself, but some other cars have the same/similar principle applied to the air filter box
Be interesting to hear if anyone has just run with a bolt on filter
Unlikely its cracked...but whether it is or not it makes a lot of noise

There are splits in the rubber bungs to allow you to drain any collected watter (like fording 1 metre streams
just squeeze the bungs - there tends to be a whistling noise rom them past the splits - seems normal

can you repair the split with some tape? doesn;t sound like its pressured, so this would prob work?

The splits are there to allow moisture out and not in - I would leave them alone unless they're damaged

thanks chaps

it is definitielt cracked. looks like it's been banged at some piint, and its split right along the seam.
i've done 20,000 miles with it like that, and it's always passed MOT's....so it doesn;t seem to be problematic, i was just scratching my head as to what it was and what it is there for!

regards

nick

just seal up the split with fibre glass or even gaffer tape.

Sorry, I didn't read the post properly - didn't realise the actual tank was split.