[V6-12v] Car not starting

[The CyberPoet]

The theory, the fuel cap has a spring mechanism designed to permit it 
to breathe in under vacuum (but not out) to permit air into the tank to 
replace the fuel that is being consumed. If that valve in the gas cap 
goes bad, vacuum can build up in the gas tank as the fuel level drops, 
offsetting the power of the pump to move the fuel forward. This is the 
case for all cars built tp US-specs since 1974 (as well as motorcycles 
for the California market since 1980 or so).

Cheers
=-= Marc

On Wednesday, February 2, 2005, at 11:44  PM, Tom Christiansen wrote:

> At 08:31 PM 2/1/2005, The CyberPoet wrote:
>> You know, we all overlooked one of the most common, simplest reasons 
>> on the planet:
>> gas tank vapor lock.
>>
>> Unscrew the gas cap. Try it again.
>
> How does that work?? Shouldn't the fuel return line take care of that?
>
> Tom