05-08-2020, 09:21 AM
Great care is necessary to assemble with the arm on correct side of camshaft. If wrong I dunno if the arm can lock the diaphragm at one extreme, but can damage when engine turned. Operated in the hand by either lever the suck and blow can be felt, and should ditto on the car. Will self prime. Esp with the plugs out easy to carnk over by hand. There are right and wrong pump arms with very subtle differences. Air leaks on suck side of system thwart operation.