Over fuelling Issue, W116 350SE 1974
- William@secureict.co.za
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- Frischling
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Any ideas and help please. I am trying to find another pressure regulator, but have three second hand ones here and its unlikely that all three are blocked or faulty
Thanks William Davy
South Africa.
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- Dr-DJet
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what is fuel pressure value? And are you sure you connected fuel line from pump correctly? Must go directly into ring line and only at the end you have pressure regulator and damper back to tank.
See jetronic.org/de/forum/jetronic/430-auch-...ner-d-jet-frage#3888
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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Sir i think that's part of the problem. I don't have it that way. The fuel line must go directly onto the rail. is it posssible to describe the sequence as I just checked now and there is a return pipe as well which I assume the damper out pipe must be connected to. There are three pipes on the pressure regulator though and I am not sure where the out going part goes. is it possible for me to send picture which should help?
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- Dr-DJet
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was it not clear from the picture I have linked to? Vorlauf = Incoming line in yellow. Then both metal hoses go into pressure regulator left and right. Finally you take a pre-formed hose (DO NOT USE straight and bend) and connect to damper. From damper back to tank. Rücklauf = return line blue
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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Thanks for the prompt response. I am still getting used to your website and not sure where to see the picture.
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- William@secureict.co.za
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- Frischling
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Thanks a million I am going to try this and will let you know later.
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- William@secureict.co.za
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I have placed all the fuel pipes in their correct places secured them and tried to start. IT swung strongly but did not start except for a short stutter after I put some fuel into the big intake under the filter. I am not a mechanic so don't know all the terms. The previous mechanic who struggled with this eventually had to replace oil as the over fueling was getting into the oil. I have another pressure regulator that I can test, also there is very little fuel in the tank which I must fill.
what do you suggest and what can I do next? Its lock down here so I have the time hence I am trying to solve this problem which has persisted for months now.
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- Dr-DJet
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you should measure and adjust fuel pressure.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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- Frischling
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The last person did that and it came out correct 2 bars I think both sides. The person also tried an of the shelf "grey" fuel pressure regulator to see whether that would work, and it did not. But I will measure. How does one measure and how does one adjust the pressure?
I am sorry to ask all these questions but I am not a mechanic and really appreciate your help.
William
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- Dr-DJet
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if you had it wrongly connected, you would see a high pressure as flow back to tank would be blocked. Remove fuel hose to cold start valve and insert a manometer there to measure. Adjustment is on running engine via screw on pressure regulator (secured by a nut). Do not touch screw on damper!
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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- Frischling
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You are correct when testing on Saturday the fuel did fly out when opening hoses as the pressure was great.
I will get a meter and test the pressure whilst swinging the engine I assume.
I will also adjust the regulator as you say.
Should I also not try the other regulator I have?
what must the pressure be and if its below what do I do?
This I will do tomorrow or as soon as I get that meter and then come back to you.
Thanks again
william
By the way, is all this for free? Should we not be paying you for all this?
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- Dr-DJet
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please read oir 107 manual here: jetronic.org/de/107sl-wsm/107sl-wsm-cont...-107sl-ri-engc-m116D?
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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- Frischling
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I have not made any progress yet but will come back to you once I have a fuel pressure tester.
I wanted to ask whether you know where I can get a EFAW 228 tester or the Porch one you suggested in europe. I have been on Ebay have not found any.
Thanks William
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- Dr-DJet
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I have several of all of them. If it was not shipping and exporting outside the EU I would consider to hand one over. But for ZA I am sorry. That is too much trouble.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- William@secureict.co.za
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I have a mechanic friend who is an old time expert on the W116 as well and other mercs. He has worked on my cars for years. He started as a young apprentice working on W116's years ago. He told me about this machine two years ago and now you as well. He is changing his car repair business to focus on doing only restorations of old Mercs. Big interest in old mercs here and big business. we have been looking for a machine for two years. He even went back to an old firm before they closed down to try and get the machine he used there. He knows it well. We are prepared to pay any of the costs as well as what ever you want for the machines. All it requires is boxing it up and DHL to my address. we will not pay much duty here as its very old equipment and we can put a low price on it, Please Please Sir we would do anything to get one of each of these machines. It would help me to get my cars back to 100% and him in his business.
Let me know and thanks again for all your help.
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- rema350SL-H
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if you would like to pay any price, look here:
www.ebay-kleinanzeigen.de/s-anzeige/d-je.../1390834877-223-1930
But be aware that you would spoil the market if you do so.

Best regards,
Recardo
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- rema350SL-H
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I found one on ebay for less than 300€. But there was something wrong with the address. Possibly some fake.
Recardo
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- William@secureict.co.za
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- Frischling
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Its been lock down here and we have not been able to move for a few months. I am just making contact to say that I am still interested in the machine. I have also not been able to do my fuel pressure test as yet.
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- BenKraft
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- Dr-DJet
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we are a small family here and appreciate to be signing and greeting by first name. Would be great if you could accomodate with that.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Workshops D-Jetronic 22.7. Erlangen , 16.9. Frankfurt
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- Over fuelling Issue, W116 350SE 1974