"Rosine, Steve" wrote:

THe primary reason for not returning the fuel to the fuel pump inlet side

is

to prevent heating of the fuel, right?  If the returned fuel were cooled
to  ambient, then it could be teed into the fuel supply.

That's exactly what Jan Eggenfellner does with his Subaru package, here's a
clip from one of his emails to the Glastar list:  "Return fuel from the fuel
injector rail is cooled through an air to fuel cooler mounted in the front
of the engine and then simply routed back to the inlet side of the dual fuel
pumps also in the engine compartment.
This system greatly simplifies the fuel system, allows the installation of a
fuel totalizer, is safer and works great."

Perry Casson

charles harbert wrote:

I'm not sure that this a is a good idea, unless there's enough fuel quantity in
the line to prevent overheating during a long idle on a hot day waiting to
depart. Maybe there's enough air flow from the prop on a Glastar, but I'd check
to see what my fuel temp is after a hot day idle. Definitely not for a pusher
application.  The last thing you want is vapor lock on take off.
 

Since the high pressure pump is constant flow most of the fuel is returned
at engine idle. Under those circumstances it could get very hot indeed.

Paul Lamar

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