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Petrol Cap

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dl56uk | 20:13 Fri 16th Jan 2015 | Cars
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my car's red light came on for the fuel low, when I unscrewed the petrol cap there was a heavy hiss, I put 2 gallon in and it went right over the 1/4 tank mark. should this hiss occur ? and if not could the breather pipe be blocked ?
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I know nothing but suspect it is just Atmospherics (Air pressure in general) it is pretty wild at present in the North of England
Mine has always given a loud hiss on opening, since it was new.

Come to think of it I haven't heard it recently, though the car is now 11 years old.
There should be a Pin Prick vent in the cap, check kit.
Probably vapour build up because the tank was low on fuel.
My Fiesta always does this when the tank is nearly empty

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