[DML] Re: Vapor Lock

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

Vapor lock (fuel vaporization) can occur under pressure OR vacuum. It
vaporizes easier under vacuum. Did you ever see in science class how
you can boil water at room temperature in a beaker with a vacuum? Fuel
also vaporizes under pressure in cars with carburators. Typically the
fuel pump only pressurizes to 3-5 lbs which isn't much. The fuel pump
gets really hot being attached to the hot motor and the fuel line from
the pump to the carburator goes past the hot motor. With no
recirculation to keep the fuel moving it can get really hot before it
goes into the carburator which itself is very hot and now when the
fuel goes into the float chamber it bubbles like soda pop when the
pressure is released. Tricks involve spacers and insulaters under the
carburator, insulating the fuel line, rerouting away from hot areas,
and adding a pressure relief valve to allow overflow back to the tank
from the carburator. Thankfully on a Delorean the fuel injection
system is relatively immune to vapor lock if everything is set-up and
working properly. Pressure is a relative term, when your pressure
gauge says zero it is not counting 14.7 lbs atmospheric! That is where
a "vacuum" comes from.
David Teitelbaum
vin 10757 


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> I'm a late comer to this thread...
> 
> Isn't vapor lock a suction problem, not a pressure problem (liquid
> turning to gas due to lowered evaporation point)? If so, the only
> place it could possibly happen on a DeLo is inside the tank, which is
> highly unlikely given the cooling effect of all that fuel.
> 
> In theory carburetors can vapor lock because their fuel is sucked
> th




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