Fuel pump blues (i give up).

Can't really help you on your problem...maybe air getting in there somewhere?

But I don't understand why you have fears about running a rotary vane style fuel pump? Up until recently, just about every OEM fuel pump was a rotary vane style. Now they're going to a turbine style which is a little quieter and more efficient. And as far as them getting too hot...as long as its not in an enclosed box or anything you should be fine. The gasoline running through it actually acts as a coolant for the electric motor inside.

I also don't understand why people choose to run an electric and mechanical fuel pump together. Why not just get one fuel pump that can handle the job? I would think if you start having fuel delivery problems, you've now got an extra part to diagnose.