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Die Bosch D-Jetronic war 1967 die erste Großserien elektronische Einspritzung der Welt. - Bosch's D-Jetronic was the first mass-production electronic fuel injection.

Over fuelling Issue, W116 350SE 1974

  • William@secureict.co.za
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4 years 1 month ago #13937 by William@secureict.co.za
Over fuelling Issue, W116 350SE 1974 was created by William@secureict.co.za
Looking for help with an over fueling issue. Problem started after car stood for a year or more. First diagnosed ECU, replaced this. Then car would swing but not start. after much trying discovered fuel getting into oil and having to drain and refill. injectors all checked with individual cups underneath each. check rail in and out pipes from tank to damper to pressure regulator, fuel not getting through the pressure regulator. Car swings powerfully until battery runs out but does not start. Was able to get it running for a few minutes with a T piece bypassing both damper and regulator. Put everything back as it should be, including new fuel pipe everywhere but still the same.
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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4 years 1 month ago - 4 years 1 month ago #13939 by Dr-DJet
Replied by Dr-DJet on topic Over fuelling Issue, W116 350SE 1974
Hi Davy,

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
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshop D-Jetronic 20.7. (ER), K-Jetronic 29.6. (ER) & 31.8. (F)

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Last edit: 4 years 1 month ago by Dr-DJet.

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4 years 4 weeks ago #13943 by William@secureict.co.za
Replied by William@secureict.co.za on topic Over fuelling Issue, W116 350SE 1974
Good Day Volker
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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4 years 4 weeks ago #13944 by Dr-DJet
Replied by Dr-DJet on topic Over fuelling Issue, W116 350SE 1974
Hi Davy,

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
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshop D-Jetronic 20.7. (ER), K-Jetronic 29.6. (ER) & 31.8. (F)

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4 years 4 weeks ago #13946 by William@secureict.co.za
Replied by William@secureict.co.za on topic Over fuelling Issue, W116 350SE 1974
Hi Volker
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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4 years 4 weeks ago #13947 by William@secureict.co.za
Replied by William@secureict.co.za on topic Over fuelling Issue, W116 350SE 1974
Oh sherbet I am being stupid I see the link in your earlier response.
Thanks a million I am going to try this and will let you know later.

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