06-11-2019, 03:25 PM
Thanks to everyone for their input. I have dismantled both new pumps and the diaphragms seem intact. The old one that was on the car was not too reliable. The other old one I had was the one that worked beautifully so I put that one on. Duly tried to start the car and clunk - it locked up. Removing the pump and hey presto the engine turned again. It was then that I looked at the number on the arm and remembered a previous thread about this. Hopefully no damage done. So I am now putting a new diaphragm on the unreliable one which has the shorter actuating arm (ending in 5) and hoping for the best. In the meantime looking for a genuine one that works.