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Where is the Fuel pressure regulator located on a 85 Chevy S10 Blazer 4X4?

On a 1985 Chevy S10 Blazer 4x4, the fuel pressure regulator is integrated into the fuel rail. It's not a separate component like on some vehicles. You'll find it on the fuel rail itself, usually near one of the fuel injectors. You'll need to look closely at the fuel rail; the regulator will likely be a small, possibly diaphragm-operated valve incorporated into the rail's design.