I don't know if this is the only way to post this, but Mercedes does supply the overflow valve on the back side of the injection pump. I have seen repeated entries about stretching the internal spring to 27mm. After 35 years these springs wilt, and should probably be replaced.


The problem in going to the dealer and in looking at epc net online parts is that my pump shows no overflow valve, but the pump that preceeded it shows the part. I ordered this part not knowing whether it included the inner spring and ball bearing or if it would even work. BOTH MERCEDES PARTS AND EPC NET SAID THIS VALVE WAS NOT FOR MY CAR. I also admit naivety, but had I given this number on the old part to the parts department, it would have made this easier. The parts guy also did not suggest getting the part number off the valve, and did not look for it.


I have not installed the valve yet, but I called a local company that rebuilds the old IPs, and they told me this new part number is a direct replacement for what I have. If you have an overflow valve and a clear fuel line on the back of the IP, this part should fit.


The old part number is imprinted on the 17mm "nut" and it is 14174 over 13012. The direct replacement for this part, according to the rebuilder is 14714 over 13046 which is what I received from Mercedes for $23.37 net. A brillo pad should hopefully reveal the part number on your valve. I have included a photo of the old and new valves. According to the rebuilder, the ball bearing on the end of the valve does nothing but to seal the assembly. Everything critical seems identical.


FUNOLA, if you are still watching, Mercedes does not carry the smaller silver washers at this connection or the 14mm bolt on the fuel filter, but they now send a copper compression washer, WHICH MAY BE A PROBLEM. I was told that Mercedes used other washers than silver, but found that they had a metal reaction fusing the parts together which would be a big problem on the side of the IP and the head on the large filter. I am guessing that the problem is not at the brass-ended fuel lines but on the injection pump and large filter head. Using copper on either may cause you to replace or pull those two parts to fix the problem.

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1983 240D low miles 156000, and yes, MB still gives out badges