Was this an originally a 2 or 4bbl car? My 2bbl car didn't come with a return line so If you don't have one either you're looking at replacing the sending unit also with that type of pump. I was having similar issues with my car a couple of years ago and went with a simple Holley Red mounted near the tank. Problem solved so far. I'm looking to get a spare to keep in the trunk because they say they don't last forever and I am not running a pre-filter so I may be running on borrowed time already.