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How many fuel lines go to the engine on Buick Riviera?

A Buick Riviera, depending on the year and engine, typically has two main fuel lines going to the engine:

* Fuel supply line: This line carries pressurized fuel from the fuel pump to the fuel injectors or carburetor.

* Fuel return line: This line carries excess fuel back to the fuel tank. The amount of fuel returned varies depending on the fuel injection system.

While there might be smaller lines for things like fuel vapor recovery systems, the primary fuel delivery to the engine is handled by these two lines.

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