Sounds like automating your back up fuel pump would be a good idea. Their are a few different methods I can think of to do this. Monitoring your fuel pressure with a pressure switch which can then activate an annunciator light as well as the back up pump or measuing the current to the main pump, to do the same.
Rich Parker Peterbrough NH New garage is almost complete so I guess I can get back to building. :-) [LINK: http://theparkers.wwhotspots.com/] http://theparkers.wwhotspots.com