Posted for "Ed Anderson" <eanderson@carolina.rr.com>:

Hi Rusty,

     As you already know, the pumps are recommended to be mounted low and that is where I have mine.   However, as I have mentioned in previous messages, they appear to have great ability to pull fuel up hill.  I pulled fuel from a plastic marine fuel tank sitting on the ground (approx 24" uphill) and in fact collapsed the tank when I once forgot to open its vent.  This is without the lines being primed with fuel.     I suspect if there would be any problem (and there may not be) it would be getting the line "primed" with fuel up to the pumps intake.  If you are going to have a boost pump (highly recommended if your RV-3 is using wing tanks) then you could use it to "prime" the lines with fuel.  Once there is fuel to the pumps inlet, I think they would maintain the fuel in the line until shut down.  Of course, you might scratch your head a bit more and find room for the lower {:>)

By the way are you using a fuselage tank and wing tanks?

Ed Anderson