Good info on the fuel pumps, thanks. It's easy to get sucked in to thinking you need more flow capability.
Looking at the GPA-4 flow chart, the difference in pressure between 12V and 13.5V is something to consider though. Like you said Andy the alternator needs to be doing it's job.
Yep, having a good alternator really helps. If you look at flow vs. amps you'll see that running the system at 13.5 volts increases pump flow significantly but doesn't require much more current.
