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Where is the fuel regulator in a Blazer S-10 4.3L?

The fuel pressure regulator on a 1994-2004 Chevrolet S-10 Blazer with the 4.3L engine is integrated into the fuel rail. It's not a separate, easily accessible component like on some older vehicles. You'll find it on the top of the fuel rail, which sits on the intake manifold. To access it, you'll likely need to remove some components to get a good view and potentially reach it to work on.