<VV> Vapor Lock repeated again

[Ken Campbell]

----- Original Message ----- 
Subject: Re: <VV> Vapor Lock
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Interesting thing is that an electric fuel pump seems to cure all these
vapor lock problems.  and several others, also.   ....  although maybe
introducing a few along the way... such as ... " is it really still a
corvair? " ... important to some ... probably less important to someone 400
miles from home at 3 am .....
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Since the electric pump is mostly giving a little positive pressure to the
fuel line at the tank ( it being mounted below the tank, it gets a head
start from " fuel head pressure " ...

Here are some other schemes that come to mind.
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Positive head pressure ::: does vapor lock ever occur with a full tank of
fuel ( where the fuel level is presumably above the stock fuel pump? )
Wouldn't it be trick to just keep the tank 3/4 or more full to avoid these
problems.  too easy ...
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A couple months ago, my stocker threw a temper fit and wouldn't hot start,
so I stuck a air pressure hose into the intake tube ( sealed with a shop
rag ) and give it a 2 second blast ... that apparently filled up something
that was empty, it started right away..... I see a couple other posters have
done something similar ...
SO... how making a RedGreen air pressure device to pressuerize ( english
spelling ) the tank when needed?  This could be a bicycle pump in the
cockpit with a rubber air tube going to a barb fitting thru the firewall (
front trunk ) into the fuel tank.  Pressure the tank, not the fuel line.
Apparently only takes another 2 or 5 psi to "prime the system.  Ya gotta
pump fast, the fuel tank lid will act like an accelerator pump pressure
relief otherwise.
Anyway, substitute canned air pressure for the bike pump; I doubt the little
emergency flat tire air pumpers will put out enough pressure fast enough to
do the job, or even last long on a corvair.
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...... also, in my short life I remember something or other I have driven
( or flew in ) that had manual priming pumps in the cockpit ... you give it
a couple squirts, and hit the starter ... or waved at the ground crew??
help me out here, but anyway a priming only manual cylinder would be simple
enough to rig up, there are lots of little hand pumps available in MSC,
Grainger, etc.  I like pressurizing the tank better tho, it seems safer.
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I believe there is vapor lock and other hot start problems, and then there
is the " boiled off & empty float bowel" thing, from not running your vair
for a few days.  Different things, maybe all solved with a pressurized tank.
Hmmm you could have a fancy guage ( wally world for $12.95 ) on your dash to
show tank pressure ... impress your buddies...
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OH, yeah, Lon is right... sometimes a vair will start hot if you just not
flood it with the squirter in the carb; I have seen my vair start after 4
months of setting, not using the squirter ( accel pump) at all  ...  dang
vairs are such a tease, sometimes.
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Oh, if you want to build a primer pump system, you could use an aux tank
with something safer than gasoline in it .. Ethanol? ...wonder if diesel oil
will start vairs.. even for a few seconds .... a quart jug of WD-40?  or is
it the aerosol that burns when you spray it into a carburetor??
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OH.. there is yet another pressure source, I hesitate to mention this again,
but in my other life we use exhaust pressure to pressurize our tanks in our
toy race cars ... when the engine is shut off ( or blows all to heck..racing
does that, ya know .. )  the pressure immediately goes to normal, to prevent
flooding/fires  etc... this gives about 4 or  6 inches of water worth of
head pressure... just enough to feed substantially more venturi volumn than
with NA.  We do away with float bowls and fuel pumps, have about a million
of these systems running.
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Wonder if we should start a new thread on **TA DAAA * alcohol fuels and
vapor lock .. it runs cooler ... but maybe... maybe ... more volatile ...
what is the trade off ?   Oh, someone told me that you can produce grain
alcohol with a home still for about $1 a gallon ...  but the real bonus
savings for the citizens is that you stay home more drinking up the profits,
TAKE THAT, you iranians !!
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OK, I see that uses up my ticket for May ..
ken campbell, deltawerkes





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