[DML] Re: hotstart problems

["Dani B" <5n-@xxxxxxx>]

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

--- In dmcnews@xxxxxxxxxxxxxxx, "endotex23" <endotex23@xxxx> wrote:
> 
> > We can argue that something shouldnt happen all day long. However 
> even when the proper rest pressure is maintained the problem still 
> exsists.  So you can go by the book all day long and quote specs
till 
> your blue in the face but dont cry to me when you get stranded 
> somewhere.Heat soak is a constant problem with Deloreans and Fiats< 
> 
> 
> Well, you're the one with the hot start problem not me. You didn't 
> say in your first post you'd already checked rest pressure. If your 
> hot start problem persists and you have good rest pressure your 
> problem is not associated with fuel vaporization. Fuel held at the 
> specified rest pressure will not vaporize with the typical heat
load 
> presented. This isn't theory, it's physics. With proper rest
pressure 
> heat soak is *not* a problem with Deloreans, at least as it relates 
> to the fuel system.
> 
> If rest pressure is per spec and holds over time your problem is
not 
> fuel lock...period. You can't have rest pressure and have vapor 
> because vapor would prevent rest pressure. Not only does rest 
> pressure prevent vapor but, put another way, vapor would preclude a 
> correct measurement of rest pressure. Vapor is compressible while 
> liquid fuel is not. 
> 
> If you want to stick with that theory be my guest. Going by the
book 
> is the way things should be done, that and a solid understanding of 
> what it is you're working on. In addition, possessing tunnel vision 
> makes for very poor diagnostic technique. It also strikes me if 
> you're going to come here seeking help you'd be a litle more 
> accepting of those who offer it. After all, no matter what the
cause 
> of your hot start problem you thus far seem incapable of solving it 
> on your own. 
> 
> Btw, I was never once stranded anywhere in my car for any reason
and 
> it ran like a swiss watch, with no one except me ever having laid a 
> hand on it for maintenance.




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