Where is the other one located? I only know of the one that sits next to the accumulator.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Well maybe it only has one. Mine are side by side.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

I think most of the M103 vehicles only have 1, there was an update in the MB EPCnet that says at some point they went to 1 pump, probably early on. Mine only has 1 as well.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

The 124.090 wagons with engine 103.983 have two fuel pumps in a series. The second is suspended on rubber rings between the rear axle and fuel tank, and has a black plastic cover over it about the size of it.

The second pump is supposed to "prevent the formation of vapor bubbles", and the FSM has instructions on retrofitting one pump cars to two! Apparently the one pump 103.983 sedan models were 1988 and earlier.

So I have it backwards? Is it the same on the sedans? I thought my car only has one pump..... I'll be under there soon doing my differential oil....so I guess I can look then for sure.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)