[V8] returnless systems and vapor lock

[NicolCS at aol.com]

<snip>The good thing about a returnless system is that it doesn't constantly 
circulate the fuel through the hot engine bay. That is one of the reasons 
they switched, among others, I'm sure.

Tony Hoffman <unsnip>
Actually, in my understanding, it's quite the opposite.  Fuel cooling through 
recirculating to the tank is considered a plus (the tank is the cooler) and 
the return system provides a means to purge air that might be in the system.  A 
return system also promotes better hot re-starts 'cause the hot-soaked fuel 
is immediately replaced with fresh, cool fuel. Yet another advantage of a 
return system is the ability to modulate fuel pressure through control of the FPR.  
The reason mfrs went to a returnless system was cost-reduction, pure and 
simple.  

YMMV
Craig Nicol