[DML] The great vapor lock controversy -- AGAIN.
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[DML] The great vapor lock controversy -- AGAIN.

Like you, I thought the reset time for the RPM relay was so short that
it did not trigger the pump while cranking. Elvis Nocita corrected me
on that. 

The timer chip closes the circuit for about .5 seconds. Every time the
distributor rotates, it resets the timer. Let's assume that cranking
speed is 350 RPM. That means the distributor rotates 175 RPM, or
nearly 3 times per second. That's more than enough time to reset the
RPM relay's timer chip for continuous pump activation while cranking.

The fuel system should be receiving 75 PSI or so while cranking.

I don't deny that K-Jet owners have fuel delivery problems, but
whatever is wrong, it isn't vapor lock.

BTW: "Vapor lock" refers to a suction pump's inability to pull fuel
from a remote gas tank. Tank mounted pusher pumps eliminated that
problem. Feel free to look it up.

Remember that K-Jet is a continuous loop system. Whatever vapor is in
the lines should easily be routed back to the tank. Or out the
injectors ahead of the fuel. Even if K-Jet wasn't a continuous system,
don't forget that there's vacuum on the other side of the injectors.
High pressure liquid pushing from the rear and vacuum sucking from the
front side should be more than adequate to clear the lines.

Consider this: My low pressure fuel pump has no check valve. I have no
accumulator. Pull my filter loose and you're lucky to get a drop of
gas out of the lines (not the filter itself, but the lines in & out).
While idle, my fuel lines are chock full of vapors. Yet my little 4-6
PSI pump has no problem pushing them out of the way. If I can clear
the lines at 4-6 PSI, why can't K-Jet owners do so at 75 PSI? And I
don't even have the benefit of a continuous loop system (carburetion
is one way with a float & needle valve to cut of supply into the carb)).

You all are free to call your cars "vapor locked" if you want, but I
think the problems lie elsewhere.

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, "Gary Hull" <Specialty@...> wrote:
> Bill,
> If your household plumbing was full of air (or steam) how long would
it take
> for you to get a solid stream of high-pressure liquid out of the
faucet if
> you could only turn the electric water well pump on for three to five
> seconds at a time?
> Gary


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