Stephen,
You don't need to allow for expansion/contraction of the fuel in the tank
(unless you expect temperatures so low as to freeze the gas -- and I have no
idea how low that is, but probably not achievable outside a laboratory.
What you should do is this: You should either nearly fill the tank with fuel
and include some fuel stabilizer making sure you get some into the carb
bowls because that is where any gum/varnish will cause problems like
sticking, etc. -- OR -- completely drain the tank (not really recommended
because more likely to leave gum/varnish when the residual fuel
evaporates -- OR -- simply do nothing and don't worry about it.
The main consideration is that as the temperatures go up and down, the
contents of the tank will expand and contract somewhat. This will cause air
to be drawn into and expelled from the tank through the vent. This in/out of
air also brings in the humidity in the air (water vapor) which will condense
into the fuel. And, since fuel is lighter than water, the condensed water
will collect on the tank bottom. Over time, if you have lots of humidity,
you can accumulate quite a bit of water. So, at the start of the new season,
put in some fuel treatment (the kind that "eliminates water") and you should
be ready to go.
Roy
'63 TR3a TS63103LO (in restoration)
techman@metrolink.net
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