The 1999Chevrolet Blazer uses an in-line fuelfilter. This means the fuelline is separated between the gas tank and the engine by a filter, which prevents impurities from getting into the engine. A strainer in your fueltank picks out the larger pieces of junk and sediment, while the fuelfiltertraps the smaller particles. How to Change the Fuel Filter on a 1999 Blazer | It Still Runs Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how How to replace fuel filter on 99 s10 - YouTube Click to view on Bing2:40May 18, 2016What does the inside of a Fuel Filter look like after 300,000 miles? - Duration: 10:00. Chevy S10 Blazer Flex Fuel Filter Replacement with Regulator - Duration: 6:06. Chad Williams 11,934 views.Author: Gearhead LSX454RViews: 75K 1999 Chevrolet S10 Fuel Filter | AutoPartsWarehouse 1999 Chevrolet S10 Fuel Filter We have 4 Items In-stock. Select your vehicle's Submodel to continue.