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My experience isn't exactly the most current, but years ago when the GM 3800 SC cars were big (Grand Prix GTP, Impala SS, Regal GS) I ran an Alky Control kit on my GTP.
I had indicator lights to tell me when the pump was running and I always monitored the light. The issue was that I was out of town once and my cousin's car broke down. Turns out he didn't know anything about the indicator light on my car when he borrowed it. Even though I told him not to beat on the car, he decided to hot lap it and it chipped a piston ring land. The alky pump had locked up and he had no idea.
All could have been prevented if he would have just left his foot out of the gas or if I would have told him he could not drive the car while I was gone.
Long story shorter; yes, they can and do fail, but as others have mentioned, it is all about how you handle the risk. I'm sure the pumps and kits are considerably more reliable now than they were 10-12 years ago.
BK
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