I just got under the rear of my 1989 190E to change the fuel pump but for some reason there are two. Correct if I'm wrong because I do not know why there should be two or how to test which one is bad.

I have located the accumulator, filter and pump but there is an additional pump.

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Jason B.

420sel '89' 171K---Currently my daily driver

380sel '83' 122K---My first Mercedes!