I have a 1991 Chevy Silverado 4WD Manual with 189,000 miles on it. 2 years and 1 month ago I had the fuel tank replaced. I also paid to have the pump and sending unit replaced. 2 weeks ago the pump failed (only 3800 miles since it ws supposedly replaced). The guy who towed & fixed it gave me the pump he removed. We both agreed it was not replaced 2 years ago. The parts and labor to fix was $400. I'm getting nowhere toward a resolution with the shop that replaced the tank. I don't recall ever having the pump replaced before and think it might be the original.

1) Would I have a case in small claims court?

2) What would I bring as far as proving the pump was not replaced?  The pump that came off has AC stamped on it and the number 2820.