> Use a double pole switch to control the two fuel pumps. Use the second
> pole of the switch to control your fuel return solenoid valve.  Then the
> system is automatic and always return the fuel to the proper tank  --
> the one that is being used at the moment.
Thanks, Rino. This is clearly the most simple way to wire it. However, I've
found that the ability to transfer fuel is very handy during building and
testing, so I've left the solenoid independant and wired a crossfeed
warning. I'm not sure that there will be any value in keeping this option
when flying.
Regards,
John Slade