Mine is plastic. I assume someone changed it before me.Just in case it doesn't work after being installed or works briefly and goes out. I will add my experience from 47 years ago or so. I had an old A-100 van that had a problem which I just described. It worked briefly and gradually didn't. It turned out the were two or 3 tiny pin holes around the indented middle of the copper float under the arm connection. They could barely be seen. I saw tiny bubbles when I immersed it in cleaning fluid after removing the third time. I never noticed the difference in weight at the time. The float would slowly take on gasoline after being installed. It might not have filled completely but enough to affect it's buoyancy. The newer ones probably are plastic!
