"rmhou at yahoo.com" wrote in message
ups.com...
I want to add an aux tank & transfer fuel to main tank with a pump
during flight. I think it makes fuel management easier if the pump
transfer close to the engine's burn rate, say 14 gph.

Here's a recommendation for wiring. Use a timer switch as is used for
bathroom fans. It has several advantages:
1. It is not likely to be confused with any other switch.
2. You can set it for an interval which will never overfill your main tank
from the aux.
3. You can't forget to turn it off.
4. Your electric pump can transfer fuel faster than, say 14 gph, without a
problem.

Rich S.