UJPrice Posted July 11, 2012 Share Posted July 11, 2012 Hi allFreebird here using Joe's account due to being at the Nurburgring and forgetting my login password. :-/ :-/Anyway, I'm getting venting problems with the Vitesse. Big vacuum above fuel after a long thrash causing predictable results, stangely only at low speeds once thrash is over - think the fuel pump can cope at high revs. I can't see any vent holes in the filler cap, so how does it vent?Glen. Quote Link to comment Share on other sites More sharing options...
Jason Posted July 11, 2012 Share Posted July 11, 2012 You've probably got the wrong cap :-) The venting is normally through the cap Quote Link to comment Share on other sites More sharing options...
UJPrice Posted July 11, 2012 Author Share Posted July 11, 2012 OhSame cap for last 5 years - will check it out, thanks. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted July 11, 2012 Share Posted July 11, 2012 Unusual to get a cap that seals that well..... mine prevents this issue by leaking vigorously!Must be the huge fuel flows 'caused by the 'Ring...... I know one lap/14 miles dropped my 10CR 2009 tank average mpg from 35 ish to 26!Nick Quote Link to comment Share on other sites More sharing options...
UJPrice Posted July 12, 2012 Author Share Posted July 12, 2012 Nick_Jones wrote:Unusual to get a cap that seals that well..... mine prevents this issue by leaking vigorously!Must be the huge fuel flows 'caused by the 'Ring...... I know one lap/14 miles dropped my 10CR 2009 tank average mpg from 35 ish to 26!NickHi NickStrangely enough it doesn't do it at high speeds, only after slowing down after a prolonged highish speed run with a full tank. I think the vent was partially blocked and the pump could cope at high revs, but not low. Anyway, fixed now - there is a groove in the cap to vent under the seal, it was full of crud.Freebs Quote Link to comment Share on other sites More sharing options...
Jason Posted July 12, 2012 Share Posted July 12, 2012 I had a crappy cap on my first car, a Moggy Minor. It leaked badly with fuel sloshing all over the place. I replaced it with a new one from a garage forecourt (showing my age here, this was in the days when they sold such things) it had the price on it and I left the sticker on. Unknown to me this was covering the vent hole, within a few miles the car was running badly, coughing and gently dying. I was convinced I had put crap petrol in, upon taking the new cap off the filler neck there was a "whoosh" and the problem was clear. I picked the price off and never had the problem again. Quote Link to comment Share on other sites More sharing options...
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