Hissing when opening petrol cap?
#1
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I have noticed on 2-3 friends cars and my dads car that it doesnt hiss when you take the petrol cap off but mine does it all the time when i re-fuel, why is it some cars do and some dont?
#2
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Originally Posted by GTi_iTG
I have noticed on 2-3 friends cars and my dads car that it doesnt hiss when you take the petrol cap off but mine does it all the time when i re-fuel, why is it some cars do and some dont?
Theres a pressure build up in your tank - perfectly normal from what i can tell..
all my cars have done it.
same with a plastic fuel can.
#3
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vaccum
when you fill the tank its full obv, when you use the fuel it creates a void that should be replaced with air from a breather.
not too much of a problem on cars as the pumps are quite powerfull, but on my bike i have to open the filler cap after a ride to get the pressure back, as the pump is gravity fed and it cutout once due to it...
the breathers are clear tho and i aint been arsed to look into yet lol, i just open it lol
when you fill the tank its full obv, when you use the fuel it creates a void that should be replaced with air from a breather.
not too much of a problem on cars as the pumps are quite powerfull, but on my bike i have to open the filler cap after a ride to get the pressure back, as the pump is gravity fed and it cutout once due to it...
the breathers are clear tho and i aint been arsed to look into yet lol, i just open it lol
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#4
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all cars do it,, usually when you brim the tank and then run them down to fuck all
why worry about it,,, its not a problem,,,, its a little like asking why we have august imo,,,, it happens,,, one of them things
next question
why worry about it,,, its not a problem,,,, its a little like asking why we have august imo,,,, it happens,,, one of them things
next question
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#5
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Originally Posted by Ginge !
why worry about it,,, its not a problem,,,, its a little like asking why we have august imo,,,, it happens,,, one of them things
next question![Big Grin](https://passionford.com/forum/images/smilies/icon_mrgreen.gif)
next question
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Ginge you've just made my day mate, quality answer
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#7
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it'll be the breather colged up a little is all
have you tried to summon the petrol fairy sooner than when the light comes on telling you you require it's services then? does it hiss at you then?
or have you got a snake there from the preivous owner and it's just pissed off?
have you tried to summon the petrol fairy sooner than when the light comes on telling you you require it's services then? does it hiss at you then?
or have you got a snake there from the preivous owner and it's just pissed off?
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#9
just finding my feet
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Originally Posted by GTi_iTG
I never run my car into the red........ im not a female ![Rolling Eyes](https://passionford.com/forum/images/smilies/icon_rolleyes.gif)
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as it was tellme me ive got MINUS ZERO miles left,,, it was on ==== since i went to the gym yesturday to tell me ive got less than 5 miles left
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#14
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Originally Posted by tabetha
The hissing can be dependant on whether it has a device for venting petrol fumes back into engine, for emmisions reason as well.
tabetha
tabetha
My Escort has got a little solenoid in the engine bay, just below the MAP sensor, that does this venting. Opens for a few seconds when you turn the ignition on IIRC
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