1992 Mercedes Benz Other

Engine Performance problem
1992 Other Mercedes Benz Models 6 cyl Two Wheel Drive Automatic

My 1992 Mercedes 300E won't start sometime. It sound like it's not getting the proper gas. I thought it may be the electric fuel pump. Could the problem be something else. I ordered one from online but it does not look like the ones on the car. There appears to be two items that looks alike. How can I tell which one is the ritht pump. Plus the pump I received looks different from the ones on the car.
May 9, 2008.

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