[DML] Re: New Gas Blends and older cars (Martin Gutkowski)
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[DML] Re: New Gas Blends and older cars (Martin Gutkowski)

Perhaps you should consider another fuel delivery method.

My low pressure fuel pump has no check valve. I have no accumulator.
There is no rest pressure of any sort in my fuel lines (pull the
filter loose and you're lucky to get a drop of gas from the hoses
themselves). Yet my little 4-6 PSI pump has absolutely no problem
clearing the lines of whatever vapors may be in them and filling them
with yummy gasoline. If I can do that at low PSI, why can't K-Jet do
so with high pressure.

Remember that I'm using the stock RPM relay and pump wiring. My pump
is mounted in a stock tank boot. With the exception of lower line
pressure, and the fact that I do not have the benefit of a continuous
loop back to the tank, there's absolutely no functional difference
between my car and a stock delorean until you get to the intake manifold.

Yet I have absolutely no problem starting my engine, hot or cold, good
mood or bad mood, hair standing on end or combed neatly.

You do the math.

BTW: "Vapor lock" refers to a suction pump's inability to pull fuel
from a remote gas tank. Feel free to look it up. 

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@...> wrote:
> For crying out loud Bill, get your facts straight. K-Jet has a problem 
> with fuel vapourising in the lines unless a certain pressure is 
> maintained. Why? Another word for vaporising is BOILING. Petrol has a 
> much lower boiling point than water, so your analogy about domestic 
> plumbing is pointless, AND you confuse it by talking about air ingress. 
> Engine get hot, fuel get hot, fuel boil. Increase boiling point by 
> increasing pressure. Basic physics.
> I had a euro spec car in that didn't have the evapourative system and 
> the fuel was literally boiling in the tank on a hot day.
> K-Jet suffers because of the fuel held in the injector lines between
> metering head and injectors - ie the point of injection and the "valve" 
> (or faucet - tap to us brits - if you prefer) controlling the flow.
> Martin
> content22207 wrote:
> > Vapor lock has not been a problem for a half century. Dual diaphragm
> > fuel pumps introduced in the 1960's eliminated the last vestiges
of it.
> >
> > Of course the likes of Lou Costa, Kyle Franklin, and myself have
> > absolutely no problems because our fuel pumps are located in the tank
> > (electric). Vapor lock was a suction problem, not a pushing problem.
> > That's why I roll my eyes every time a K-Jet owner claims his car is
> > vapor locked. If us carbureted owners can push air out of the way with
> > 4-6 PSI, a K-Jet owner is certainly able to do so with 75-80 PSI.
> >
> > Think of it this way: Our fuel system is no different in principle
> > than household plumbing. When was the last time anyone shut the water
> > off for a repair, then couldn't get a faucet to work later because air
> > had been introduced into the system? Water pressure forces the air
> > out, then here comes the liquid. And that's at a mere 28 PSI or so.
> >
> > Please use accurate information when disparaging carburetion.
> >
> > Bill Robertson
> > #5939


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