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Is there 1 or 2 fuel pumps in a 1987 Mercedes 190e 2.3 liter?

The 1987 Mercedes-Benz 190E 2.3 liter has two fuel pumps: a primary fuel pump and a secondary fuel pump. The primary fuel pump is located in the fuel tank and is responsible for delivering fuel from the tank to the engine. The secondary fuel pump is located near the engine and is responsible for delivering fuel from the primary pump to the fuel injectors.
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