<VV> Non-Corvair Specific: Gas freezing?

[J. R. Read]

I believe the issue is not gas freezing but is moisture in the tank 
condensing and getting to a low point in the fuel line where it (the water 
which is heavier than gas) can turn to ice and block the fuel line.  The 
idea behind keeping the tank full of gas would be to leave less space in the 
tank for moisture (water) to accumulate.  I don't have a clue if this is or 
was correct, but it would seem to me that most (all probably) tanks are now 
non-vented  on modern cars and the issue would no longer exist regardless 
off how full (or empty) the tank might be at the moment.

This post will likely upset Smitty since it is not based on actual 
experience.

Later, JR

----- Original Message ----- 
From: <ricebugg at comcast.net>
To: <virtualvairs at corvair.org>
Sent: Monday, December 23, 2013 9:22 PM
Subject: <VV> Non-Corvair Specific: Gas freezing?


> All:  My wife ask if we should fill up the tank on her RAV tonight.  We 
> then had a conversation about keeping at least half a tank of gas in the 
> car during cold weather like we are having now in Central Illinois.  She 
> thought it was to keep the gas from freezing.  I told her it was to give 
> you heat if you get in trouble, assuming the motor is still running.  I 
> realize condensation inside the tank can freeze in a fuel line, but that 
> it is rare.  Never had it happen in 40 plus years of driving up here.
>
> I assume one of you chemist types will know the answer here.  The question 
> is, just out of curiousity, what is the freezing temp of gasoline?  I 
> assume it will freeze at some temp, but so far down the scale everything 
> else in the car has become non-functioning.
>
> Thanks,
>
> Historically Yours,
>                    James Rice
>
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