When I read your post title, I was shocked. I use Lucas every few tanks (like every 1000 miles). I would think Lucas lubricates the pump and the fuel system as well as clean out the engine, but I could be wrong. Also you really should have added it to a full tank of gas. That lowers the concentration of the Lucas so it doesn't cause problems. Someone told me not to use it too often because it might gum up the fuel system. Maybe you just got a bad pump that had an internal problem aggravated by the high concentration of the additive..... See if it is under warranty. Some good parts stores have long warranties (sometimes lifetime limited warranties). Also if you really believe the additive caused the failure, contact Lucas themselves and tell them your story. If they really care about customers, maybe they would even fix or send you a new pump. Just my $0.02. Good luck.
2007 Chevy Trailblazer LT (22,000 Miles)
Mods: PCM of NC Transmission cooler, Interior LEDs
1998 GMC Jimmy 4x4 SLT (128,000 Miles)
Mods: Eurotails, Cold Air Intake, B&M transmission cooler, Throttle Body Spacer, Posi-Lok, interior LEDs