BSCC- Vapor Lock

[Chuck Cromwell]

Hello

David is 100% correct. I have worked on 100s  of Corvairs and never seen
a vapor lock. I would suspect the coil.

Chuck

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  ----- Original Message -----
  From: "David, Cynthia, and Elliot Silvia"
  To: "Bay State Corvairs \(MA\)"
  Subject: Re: BSCC- Vapor Lock
  Date: Mon, 18 Sep 2006 22:52:26 -0400

Sometimes these problems can be daunting especially when they are
intermittent. There is another possibility, I mentioned that vapor lock
was unlikely but I assume the insulator blocks are in place under the
carbs.  You might want to check just to be sure sometimes people use the
little gaskets instead! You should be able to see them under the carsb
with a small mirror.  They are about 3/16ths of an inch think and are
hard plastic/fber. 

  ----- Original Message ----- From: jt09330 at comcast.netTo: Bay State
  Corvairs (MA)Sent: Monday, September 18, 2006 10:02 PMSubject: Re:
  BSCC- Vapor Lock
  Thanks David. We did look down the carbs and no gas was squirted. The
  first time this happen it was a very hot day. I had shut off the car
  and my wife and I went in for lunch. When we come out it would not
  start. I removed the entire breather assembly and let it cool down.
  The I had my wife try to start it while I tinkered with the cokes.Chuck
  Leonard suggested the fuel pump also. My plan is to check the
  pressure.

    -------------- Original message --------------
    From: "David, Cynthia, and Elliot Silvia" <porsche944 at ids.net>

My two cents- While I may be new to the club I have had a lot of old cars
and trucks, including many Corvairs, and I have spun a lot of wrenches on
them.  I know that somone will beg to differ, but everytime I have heard
of a problem and it is attributed to vapor lock - it isn't.  While vapor
lock was common on very old cars because of the lack of a fuel pump
(engines were gravity fed from a tank in the cowl), it simply doesn't
happen often on anything with a fuel pump.  It also can't happen when the
car is running.  The theory behind vapor lock is that the gas gets heated
in the lines and vaporizes causing a non-start problem on a hot engine
that has been recently shut off (hot soak condition).  Fuel in motion
will not tend to vaporize in the line.  It does not mean that the problem
is not heat related, I just seriously doubt it is vapor lock.  I have
gotten Corvair engines super hot and ruined them in the process, but
never experienced a probelm with vapor-lock.  So what to check?I have
seen ignition coils go bad when they get hot, a condenser that goes bad
when hot, and bad connections to the ignition.  When this happens again,
check for spark.  it is still possible it is fuel related, like a fuel
pump problem, so pull off the air cleaner and look down the primary carbs
with the engine off, push down on the accelerator linkage and see if you
get a "squirt" of fuel, if ya do - it isn't vapor lock.  Good luck Dave
PS - Just recently I had a problem on my porsche that the prosche club
members told me was vapor-lock, it wasn't - it was a bad reference
sensor. 

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