FW: <VV> Gas Tank

[Brandes, Guy]

Hi all,

In many states the fuel already has ethanol added and if so you
shouldn't have to add dry gas.  If I'm mistaken on this please let me
know.

Regards,

Guy Brandes
65 VAIR 140

 
Yes, probably more gas tanks rust out from the  INSIDE than do from the 
OUTSIDE.  It's not that the gas you buy has water  in it (at least not
usually) but 
the fact is that the Corvair gas tank BREATHES  through the vented gas
cap.  
So as the day cools off into evening, the air  pressure in the tank
drops and 
moist air is sucked into the tank.  Further  cooling of this air in the
tank 
causes the humidity to reach 100% and moisture  condenses out of the air
and 
falls into the gas.  Being heavier than the  gas, the condensed water
falls to 
the bottom of the tank and if left there will  eventually rust through
the 
bottom of the tank.
    Short of keeping your Corvair in a humidity  controlled environment,
what 
you have to do to prevent this is to periodically  add "drygas" to the
gas in 
the tank.  This alcohol causes the water  condensate to DISSOLVE in the 
gas/alcohol mix and be distributed  evenly throughout the gas in the
tank where it 
will do no harm.  While you  can use methanol based "drygas", the
isopropanol 
version is much more effective  even though it does cost a bit more.  In

northern NJ I use "Iso-Dry".   Read the label to tell if it contains
methanol or 
isopropanol.  Try it  unless you enjoy replacing/repairing leaky gas
tanks.<GGGG>
    Frank "alcohol has many uses"  Burkhard