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Where is the fuel pressure regulator located on a 1978 Cadillac Seville?

On a 1978 Cadillac Seville, the fuel pressure regulator is integrated into the fuel distributor. There isn't a separate, standalone fuel pressure regulator like you'd find on later fuel-injected systems. The fuel distributor itself controls fuel pressure and metering. It's part of the Bosch K-Jetronic fuel injection system.