On 2/14/05 1:13 PM, "AAG - Larry Word" <word_aag@COMCAST.NET> wrote:

> I've driven my 1985 Vanagon for years without a gas cap as it has that metal
> over gas inlet hole.....
> 
> Does not having gas cap affect (1) mileage and/or engine's computer?  I do
> understand it would
> affect emissions but I'm not in that kind of County.
> 
> Any thoughts to tell me "why I should replace my gas cap"....
> 
> Larry
> Georgia
> 
> 
> 
> 
>> Anyone got one?  Local filling station new kid didn't know how to
>> operate Vanagon locking gas cap....
>> 
>> Jim
>> 
>> 
>> The first lemming to lead his peers off the cliff is a bold and
>> decisive leader.
>> 
> 
> 
Depending on how effective your vent lines and cannister are, a slight
increase in mileage.  So small you probably wouldn�t notice it.  Would
probably only be detectible under lab standards.

Anybody with a newer fuel system will get an alarm if the cap doesn�t fit
right.  I forget which codes, but I have learned that many mechanics go
straight for the expensive diagnostics and replacements.  The culprit is a
pressurized fuel system that includes the tank.  If the cap leaks the
computer thinks you have a leak and will either flash codes or maybe even a
hard code and send you into limp mode.

At the flaps you have to be sure to get the correct cap for those vehicles
as both types will fit.  Unfortunately the vehicles using that system use
the same fuel caps as the rest of the cars.

����������������������������������������
jimt
Planned insanity is best.
Remember that sanity is optional.
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