Underhood Temperatures

[Shannen Durphey]

Is the problem caused by leaky injectors?  No, not that I've seen.
Is it caused by design faults?  Well...  That requires more knowledge
about the design process than I have.  

As a tech, my goal is not necessarily to ferret through the myriad
"whys" behind a system's design, but to understand what is
malfunctioning, and why, then find a "good fix".
Ford 8 cyl pfi trucks that vaporlock have fuel rails close to the
intake manifold.  Put a trailer behind the truck on a dry 100 degree
day, travel down the highway for 40 miles, and the rails get hot
enough to burn skin.  Adding extra line to the return side and
clamping it to the frame rail opposite the exhaust is a good fix.
Shannen

bernie at innovative.iinet.net.au wrote:
> 
> Shannen Durphey tapped away at the keyboard with:
> 
> > > Vapour lock isn't generally a problem; even at elevated
> > > temperatures, if you can maintain a high fuel pressure.
> > > Hence the use of check-valves and even pressure-switches
> > > to overcome the effects of heat-soak.
> 
> > Justa note... Vapor lock is less uncommon than you might guess when it
> > comes to efi cars.  Least in my experiences as a mechanic.
> 
> Would you say that's more due to component failure (e.g. leaky
> injectors) or design faults (e.g. under-estimation of heat-soak)?
> 
> --
> Bernd Felsche - Innovative Reckoning
> Perth, Western Australia
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