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Great minds think alike <G>.

I also used the soft .375" Al tubing from the wing tanks, and installed a
crossover valve in case one of the xfer pumps failed. My xfer pumps are
mounted on the back of the NLG tunnel.

One enhancement that I recommend to everybody: Make your internal and
external header tank vent line out of .375" tubing, not .250". Although I
have not performed the test, it might be possible to overpressurize the
header tank with both transfer pumps running and the header tank full until
it overflows out the vent. Eventually I will install a tygon-standpipe to
limit the pressure and see what happens when I try this out...

My friend has a HI-LEVEL audio/visual alarm on his header tank to remind
him to shut off the xfer pumps if he forgets and leaves them on.