Those pumps simply get sticky when they get long in the tooth. I’ve had them seize when sitting. I then popped it off and spun it by hand and it ran fine for a while after. It’s letting you know it’s time for a new one.
Imagine wearing your kid's high school Star Wars shirt to work and ending up on Portnoy TV.
The funny thing is he didn't even appear to have heard the score. Just had a vendetta with Portnoy.
The guys I know that have them really like them. Just don't pump DEF into the fuel tank. Expensive mistake one of the guys made, but his insurance covered it. Farmer umbrella always helps with that big premium every year.