Reply to "My 1972 Pantera won't start"

It could be fine rust particles from the stock steel tank clogging the system. Replacing and cutting open the filter would help determine that. Or it could be the pump, which he could help test with some extra hose and a fuel pressure gauge added temporarily inline after the pump and hung somewhere you can read it under load through the rear glass. I assume he set the float levels on the new carb. I have also basically burned out fuel pumps from the rust issue before I had discovered the rust, where one pump failed during, another soon thereafter. If you have to pull or replace the fuel tank, that requires pulling the entire engine/transaxle on a Pantera, so hopefully not that, but not all that hard even if so, just would need to find fellow enthusiasts willing to help do it for pizza and beer instead of shop hourly rates. Stainless tanks are available for around $1,300 last time I looked, or the stock tank can be coated inside much more cheaply but probably a less permanent solution if you have tank rust. But hopefully it's just the pump (or an old clogged filter that never got replaced in the conversion). Or inconsistent voltage to the pump, easy to check with a voltmeter (if you have an electric pump). I suppose there could be an obstruction elsewhere (I think there was a mesh sock on the sending unit's fuel pickup tube in the tank as well that you could remove if still there, but you'd have to pull that 1/4 glass above the fuel tank to get the sending unit out to check it, and that glass is not always easy to get back in), but these are the most likely sources. I had that issue with the same symptoms on a 928 years ago that shops could never find, and a friend who encountered the same on a 968, found his problem there as well, but those have a plastic housing that if/when that assembly pops off, will intermittently obstruct fuel flow at the pickup tube in the tank. But I doubt any "sock" is your issue here.