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fuel cap fix?
Posted: Fri Nov 19, 2010 1:40 pm
by skater
Hi,
Quick question. Is the fuel cap "serviceable"?
Mine does the "air sucking" thing when opened after a longer journey,
especially if brimmed before journey.
Have searched but didn't find my answer.
Thanks, James.
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 4:48 pm
by 2sticks
That's how it should be. There is a vacuum relief valve in case the
pressure (vacuum) gets too low in the tank which will stop the tank
collapsing. It's designed to stop fuel fumes escaping from the tank.
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 6:04 pm
by skater
So there shouldn't be an " intake breath " when cap opened?
Should the vacuum relief valve keep pressure equalised as the fuel is used?
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 7:01 pm
by teenmal
skater wrote:So there shouldn't be an " intake breath " when cap opened?
Should the vacuum relief valve keep pressure equalised as the fuel is used?
Hi skater,
That how it works,
Cheers..
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 7:11 pm
by skater
That's what I thought.
So my cap doesn't seem to be relieving the pressure drop.
Has anyone fixed theirs or do I just buy a new one?
Thanks.
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 7:53 pm
by francophile1947
I think they may be designed to keep a slight vacuum, because mine always did make a slight hiss when removed.
However, mine did bung up (probably with veg oil), so I just put it in hot, soapy water for a few minutes, until I could easily suck air through it - no problems since

Re: fuel cap fix?
Posted: Fri Nov 19, 2010 8:54 pm
by skater
ah, good idea. probably won't try sucking through it though.

Re: fuel cap fix?
Posted: Fri Nov 19, 2010 9:29 pm
by mister munkey
If you need one, I have a spare cap Skater, PM me an address & I'll bung it in the post.
Re: fuel cap fix?
Posted: Fri Nov 19, 2010 9:45 pm
by francophile1947
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 12:43 am
by brorabongo
I stripped my cap at the beginning of July, and never bothered putting back together since. I don't run with a full tank, as it might leak through the cap? I've not noticed any difference in the running of the Bongo.
http://www.igmaynard.co.uk/bongo/forum/ ... ap#p427070
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 10:30 am
by skater
Thanks mister munkey, have washed mine as recommended
Haven't done long journey yet but think the intake breath seems a bit less when checked so far.
James.
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 11:03 am
by haydn callow
Intake breath is normal !!
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 11:36 am
by Barrington
Ive always had slight intake of breath from the fuel tank mostly on empty, is this normal then????
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 11:44 am
by haydn callow
yes
Re: fuel cap fix?
Posted: Thu Nov 25, 2010 11:46 am
by Barrington
Cheers Haydn
