I've seen the issue come up on Facebook and there is a thread on this site from December of 2024. It has now happened to me. Here's the link to the December 2024 thread here, and pictures of the pump that failed me. We had thought we found the cure by swapping out the plugs in the bottom that hold the spring and check ball. It didn't help in this case.
Steer clear of Hepolite oil pumps!
oil-pump-exploded.1013781
Steer clear of Hepolite oil pumps!
oil-pump-exploded.1013781