[DML] Re: Vapor Lock

["content22207" <brobertson@xxxxxxxxxxxx>]

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
through the jets, not forced under pressure. In practice I've never
had it happen to me. But then again I don't live in Denver CO (I
believe altitude also lowers evaporation point).

BTW: My PRV is now carbureted. Drove it all summer, including
cloudless high noon on treeless interstates, with no fuel delivery
problems. 

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Dani B" <5n-@xxxx> wrote:
> It is virtually impossible to have vapor lock in this fuel system
> set-up. As far as "heat soak"?- Which African desert are you driving
> your car through and how are you obtaining your heat soak data on
> DeLoreans and Fiats? First of all the intake and block etc are all
> aluminum which
> dissipates heat faster then cast. The pump is in the tank which is
> delivering fuel at temperatures that can be heated much more before
> vapor lock. The intake and Fuel distributor is located too far above
> the engine to get hot enough even if you covered the vents on the
> engine bay cover. It's impossible to get the injector lines hot enough
> as well as the fuel is constantly being injected into the engine, even
> with STEEL lines you don't have vapor lock. We have a pressurized
> system here where fuel is constantly being moved around or sitting
> under pressure, not floats
> and sitting fuel in a carb right on top of an open hot engine! You see
> vapor lock from a hot fuel pump
> where it is mounted to a CAST engine or if you are using a Carb- your
> carb is too hot, stuff like that. I've never heard of vapor lock or
> percolation with an injection system, only carbs. If this was a
> problem, the engine cover would be vented over the distributor and
> etc.     
>  Hard starting can be due to a million different things, put new head
> gaskets on, make sure ALL your components are working, make sure all
> your wires are powering everything they're connected to (It may be
> connected, but is the power flowing
> through the connection?), no vac leaks,
> on and on and on.  If everything is new and maintained then there
> is no
> way you can have problems- and if all else fails, buy a new
> motor, fuel system, or even a giant fan in place of your engine cover
> ;-)...Let us know what happens- Dani B. #5003
> 





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