Fuel tank vents?

itchyfeet · Apr 28, 2013

Hi all,
when taking off my fuel filler cap I get quite a lot of pressure build up. Is this normal or are there some tank vents that are blocked? If so are they an easy repair/fix?

many thanks,
itchy.

wammers · Apr 29, 2013

If it's a petrol there is a valve in the emissions system that is supposed to open and vent excess pressure into the induction system. Maybe that is sticking or not working. Look at RAVE for details.

itchyfeet · May 6, 2013

Hi Wammers,
I've been away for a couple of weeks and have only just caught up with your reply. Thanks for the info and i'll check out RAVE as suggested.:beer2:

sas1810 · May 6, 2013

wammers said:
If it's a petrol there is a valve in the emissions system that is supposed to open and vent excess pressure into the induction system. Maybe that is sticking or not working. Look at RAVE for details.

I know this is a bit of a daft question, and sorry for jacking the post, but if that said valve is faulty, could that induce bad running?

Datatek · May 7, 2013

sas1810 said:
I know this is a bit of a daft question, and sorry for jacking the post, but if that said valve is faulty, could that induce bad running?

I doubt it, pressure in the tank is normal on modern petrol cars as venting to the atmosphere is not allowed, there is always considerable pressure in the MR2 tank especially on a warm day.

itchyfeet · May 8, 2013

aahh,
that doesn't explain my rough running then? Booked into an Indy next week to get the fault codes read.

Fuel tank vents?

itchyfeet

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