I guess the Holley electric fuel pumps, and running them deadheaded, can be all bad, I have been running the same Holley "Blue" fuel pumps and regulators for over 30 years now, in my Fairmont. No return line, no relay, ..no problem. All I have ever had to do, was replace a bottom cover gasket, that would leak for a short time after sitting in the garage all winter, about 15 years ago. That said, they are pretty noisy, and I decided years ago that a good Carter mechanical pump was good enough for the vast majority of my street cars, basically like a factory 428 CJ pump. No noise, no wiring or figuring out where to mount an elecrtic.