ashg
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 posted on 26/4/11 at 04:55 PM |
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Urgent Fuel Tank Breather Issue
This could be a major issue for me as i am off on a road trip tomorrow. changed my fuel filler cap for a new shiny one that is meant to be
breathable. click took the car out for a test drive today
and thought i better fill the tank in preparation for tomorrow. as i undid the cap there was so much pressure it blew the cap off. obviously the
tank is allowed to breath in to stop a vacuum but it is not letting the pressure build up in the tank out.
should i leave it as is and hope all is ok. put a very small pin prick in the top of the filler hose at the highest point to let the excess pressure
out or modify the cap.
the clock is ticking and i dont have time to get a new cap (old one went out in the bin :-( ) what should i do?
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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big_wasa
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| posted on 26/4/11 at 04:59 PM |
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Remove the breather valve and just loop a pipe up and down untill you can get a two way valve.
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Hellfire
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| posted on 26/4/11 at 05:17 PM |
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Another option would be to drill a small hole in the fuel filler tube just below the cap.
Phil
[Edited on 26-4-11 by Hellfire]
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rallyingden
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| posted on 26/4/11 at 06:15 PM |
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I've got the same cap and the same problem. I have done 300 mile now with no major issues other than I think I may be over pressurising my
40's. But the way it makes me drive it its not that long before I have to take the cap off to re fill. Its on my list to do 
RD 
[Edited on 26/4/11 by rallyingden]
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907
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| posted on 26/4/11 at 06:36 PM |
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Assuming you have a 2" rubber hose onto the underside of the filler,
I think I would just loosen the hose (jubilee) clip, or remove it completely
and take it with you.
You could then get the proper vent valve without messing anything up.
Cheers,
Paul G
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