Inspecting Spark Plugs for Cracks And Wear

This is a plug with 75,000 miles on it that is firing normally. No large deposits, not discolored . Reddish or green deposits would indicate burning coolant. Black, sooty deposits would indicate burning oil.

Also check for hairline cracks in the porcelain insulator (1).

Question: want location of fuel filter on 2002 buick v-6 3800 model
 Answer: That depends on what model Buick you are talking about. It is either on the right or left side of the fuel tank.