When I bench tested it, it pumps fuel, when installed on the car and turning the motor over and fuel line disengaged and placed into a bucket it does not pump fuel.
Witw it still installed on the car, and using an electric pump and gas can to run the engine, it still does not pump fuel.
OK, that is good testing. Sure sounds like a lever problem on the pump, or the eccentric. Any chance this is an odd pump lever that is not right for this engine?
BTW, I re-read your last post and you still have not eliminated the chance that there is a crack in the rubber line from tank to steel line that is just pulling air. See the list in post #5.
Also, if you turn the engine so that the eccentric is down and to the right (about 7 oclock when looking from the front), when you install the pump, you will have to push the pump up hard up into place to push the pump arm against the eccentric. If the pump lines up on the bolt hols easy-peasy with the eccentric in that position, something is wrong.
