TOM PITTENDREIGH wrote:

I've read a lot of messages and seen a lot of beautiful color diagrams all
on this problem of returning unused [presurized] fuel from the injector fuel
rail to the supply tank(s). IMHO folks are missing some of the basic laws of
fluid dynamics or even simple "seat of the pants" hydraulics. This higher
pressured fuel can be returned to the supply side of the fuel system at any
place the pressure is lower than what it is at the "overflow" side of the
fuel rail relief valve. This means that you can "tee" it back into the
supply hose right at the input side of the fuel pump. It doesn't have to be
piped all the way back to the tank(s) and "poured" back in.

I think you are forgetting about the excess heat in the return fuel Tom.
You don't want it right at the intake of the pump as the fuel supply could
get hotter and the pump vapor lock. Also for vapor lock reasons one would 
like to have the pump buried in the fuel tank.

Paul Lamar
 
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