Originally Posted by johnbright
What if one is using EFI with no mechanical fuel pump?
A single main bus works for most conventional aircraft, both VFR and IFR, with varying levels of backup and redundancy depending on your mission.
If you are running an electrically-dependent engine or some other alternate configuration, the manufacturer of those systems typically specifies the needed electrical system and you should follow that.
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.
VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.