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Old 03-20-2003, 10:38 AM
Posts: n/a
190e fuel pump

My 1990 190e is not getting gas to start, so I decided to change the fuel filter first. That did not help but in the process the upper fuel pump connection started leaking although I never loosened it up to begin with and did not leak before I changed the filter as far as I know. Can you test the fuel pump after you take it off the car? Will the gas tank start emptying when I disconnect the fuel lilne to pump? It is full. Do you have to replace both fuel pumps if one is bad? Car is not getting gas to start for whatever reason.
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Old 03-20-2003, 11:56 AM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,974
Yes the gas tank will start emptying when you take the upper fuel pump off, be careful.

You theoritically don't have to change both pumps but if one died the other one is on its death bed.

You probably could check them outside of the car. It would be fairly easy to check them for flow, harder to check them for pressure. When I changed mine they both, ran but one rattled It acted up when it was warm so I couldn't really check for that
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Old 03-20-2003, 02:14 PM
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Join Date: Sep 2002
Location: Kingsport, TN
Posts: 375
Hi monti,

mine leaked throught the connector as well. First one leaked throught the banjo bolt and after tightening it, the other leaked through the connector. This was on a 1987 420. I replaced both. I siphoned off most of the gas and put it in my other vehicle. I made a clamp out of 2 ball point pens held together with rubber bands at the ends. The pump comes with new check valve installed. If your setup is anything like a W126, the routing of the hoses and the little offset of the pump from the center holding clamp is important. It makes it easier to put the protective box around at the end.

Good luck

Reinhard Kreutzer
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Old 03-20-2003, 04:18 PM
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thanks for the advice guys. I guess I will see about getting some fuel pumps and try that if I can get the old ones loose. With my luck the pump was not the original problem. I did notice that the pumps on it were remanufactured replacements though.
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