<VV> Now Fuel Pumps

lonwall@corvairunderground.com corvairs at pacifier.com
Mon Jul 29 16:04:17 EDT 2013

Guys - How do these cases of "vaporlock" differ from a loose incoming 
gasline fitting?

Lon Wall

On 7/27/2013 10:43 AM, Smitty wrote:
> Smitty Says;   Frank I like you.  I don't care what your wife and friends
> say about you, I think you are OK. GGGG  On one of my many cross countries I
> started experiencing vapor lock symptoms.  (The car, not me).  From KC to
> Denver I never made a highway stop and got more than a mile down the road
> without the engine quitting.  Quick fuel stop or stop for a burger at a fast
> food emporium and I would be digging into the soft drink cooler very soon.
> Longer stops like following SWAMBO through a Wallmart and it would fire
> right up and never miss a beat as long as I kept peddling.  Got to Denver 20
> antique stores and a chest of ice later I broke out the wrenches.  Opened a
> fuel line at a carb after a forced stop and had no fuel there.  In spite of
> the vapor lock symptoms I broke down and put my standby pump on.  Not one
> more problem the rest of the trip.
> I am not so stupid as to think that everyone that has a vapor lock problem
> has a weak pump.  But there is one case where a weak pump was the problem.
> Back home I dissected the pump and found the valves were of some material
> that looked like hard rubber, and one of them was badly deteriorated.  One
> instance does not indicate a trend, but I did experience that one instance.
> Date: Sat, 27 Jul 2013 01:40:37 -0400
> From: Frank DuVal <corvairduval at cox.net>
> The test I perform to see if the car has vapor lock, due to high fuel pump
> temperature, is to pour ice or ice water on the fuel pump. If fuel then
> starts pumping to the carbs and the car starts, there you have it, hot fuel
> pump boiled the gasoline inside to a vapor state. Not enough vapor can be
> pumped by the pump to run a Corvair engine and the vapor escapes from the
> carb vent before it gets through the main jet.
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