Fuel Filler Caps

[George M. Dailey]

Actually, if you put a vacuume on the tank,  with a high temperature, the
fuel may just boil away. Any body know the vapor pressure of gas at 90F and
15" of hg? Or is it a vapor under these condition?

GMD

At 09:47 AM 2/12/97 +0000, you wrote:

>> Most fuel injections systems do have a reasonable amount of pressure
>> in the tank, as every time I open mine to refill (Lincoln
>> Continental) I hear this "ffffst" sound.
>> 
>> Fred
>
>A small point, I think it's actually a vacuum.  The charcoal 
>cannister and engine vacuum are used to maintain a slight negative 
>pressure in the tank in order to reduce evaporative emissions.  
>Supposedly a defective cannister system can collapse a gas tank by 
>applying too much vacuum, but that may be an urban legend.
>
>--steve
>
>