HI Ron, yes, you need to investgate ,I had one breakapart , alloy or mattic i think it was called k??( hardened chewing gum ?) just disintegrated around the neck so check the case as well .Mine went due to a bit of debris from the rebuild about a year after reusing the bike ,just at start up thank god , just felt slightly more resistance to the kickstart when starting followed by a a small unpleasant click and bingo no oil coming back to the tank. I'd always check that before setting off on a ride. Stopped it then and found no further damage just cleaned it outand fitted a new one. If you need a pump I've got a spare just lets me know regards Bob H.