Re: [DML] Re: New Gas Blends and older cars

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

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 the 
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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