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Over fuelling Issue, W116 350SE 1974

  • William@secureict.co.za
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19 Mai 2020 14:58 #13937 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
Over fuelling Issue, W116 350SE 1974 wurde erstellt von 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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19 Mai 2020 17:27 - 19 Mai 2020 17:28 #13939 von Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Volker antwortete auf 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 oldtimer.tips/de/forum/jetronic/430-auch...ner-d-jet-frage#3888

Viele Schraubergrüße - best regards, Dr-DJet Volker
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Letzte Änderung: 19 Mai 2020 17:28 von Volker.

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20 Mai 2020 09:34 #13943 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf 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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20 Mai 2020 09:39 #13944 von Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Volker antwortete auf 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

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20 Mai 2020 09:47 #13946 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf 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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20 Mai 2020 09:50 #13947 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf 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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20 Mai 2020 12:06 #13949 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf Over fuelling Issue, W116 350SE 1974
Good afternoon Volker
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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20 Mai 2020 13:03 #13950 von Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Volker antwortete auf Over fuelling Issue, W116 350SE 1974
Hi Davy,

you should measure and adjust fuel pressure.

Viele Schraubergrüße - best regards, Dr-DJet Volker
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20 Mai 2020 13:13 #13951 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf Over fuelling Issue, W116 350SE 1974
Volker
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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20 Mai 2020 14:42 #13952 von Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Volker antwortete auf Over fuelling Issue, W116 350SE 1974
Hi William,

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
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20 Mai 2020 14:53 #13953 von William@secureict.co.za Mercedes-Benz W116 280 SE/L, Mercedes-Benz W116 350 SE/L, Mercedes-Benz W116 450 SE/L
William@secureict.co.za antwortete auf Over fuelling Issue, W116 350SE 1974
Hi Volker
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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20 Mai 2020 20:20 #13954 von Volker Europe Mercedes-Benz R107 450 SL, Mercedes-Benz W111 280 SE Cabrio
Volker antwortete auf Over fuelling Issue, W116 350SE 1974
Hi William.

please read oir 107 manual here: oldtimer.tips/de/107sl-wsm/107sl-wsm-con...-107sl-ri-engc-m116D ?

Viele Schraubergrüße - best regards, Dr-DJet Volker
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