[DML] Re: New Gas Blends and older cars (David Teitelbaum)
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[DML] Re: New Gas Blends and older cars (David Teitelbaum)

Thank you for using the term "vapor lock" properly. I grow weary of
K-Jet owners using it for whatever other ills they may be suffering.

It's a moot point here, but dual diaphragm fuel pumps did go long way
towards eliminating true vapor lock. Vapor locking was not an issue in
the 1970's, even though the tank was still in the rear and the pump
mounted to the engine.

As you stated, my pump pushes fuel from the tank. It is mounted in a
stock DeLorean tank boot, using the stock wiring circuit. It does not
have a check valve, however, and I ran a new fuel line that bypasses
the accumulator. My lines have absolutely no rest pressure whatsoever.
Yet my little pusher pump clears them of any vapors quite easily, at a
mere 4-6 PSI. My question is: If I can do that at low pressure, why
can't K-Jet do at high pressure?

The answer, of course, is that it can. As you noted, vapor lock is not
a pusher problem. 

See my response to Gary Hull for a discussion of the RPM timer chip. I
used to think that it did not activate the pump continuously during
cranking, but Elvis Nocita corrected me on that. 

Regarding vintage technology versus more recent: You and I should just
agree to disagree. Part of the problem may be our hierarchy
priorities. At the very top of mine is simplicity, followed very
closely by reliability. Ease of maintenance is not far behind, as is
low cost. Obviously these priorities are not compatible with K-Jet.

I still shoot 35mm BTW.

And record cassette tapes from my extensive collection of vinyl.

Stop by the house some day and I'll pop a tape in the trusty old VCR
for us to watch together.

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@...> wrote:
> Vapor lock has ALWAYS and will continue to be a problem on cars that
> have the fuel pump on the motor and have to pull a vacuum all the way
> back to the tank to get the fuel. It will be even more of a problem as
> gasoline gets mixed with more and more additives. I was not refering
> to any cars that have a transfer pump in the tank to push the fuel
> under pressure to the motor. In fact I did mention that Deloreans do
> not have such a problem and even a Delorean with a carbureator should
> not as long as you use a pump in the tank to get the fuel to the
> carbureator. The problem with carbureation is it's inherent lack of
> adjustablity and controlability especially with today's need for
> effiecancy and air quality standards. It is old technology and is a
> step backwards to convert a fuel injected car to carbureation. Kind of
> like sticking film into a digital camera IMHO.
> David Teitelbaum
> vin 10757


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