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.

Benzin pumpe von 3 auf 2

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10 Mar 2026 12:28 #24521 by MB280
Benzin pumpe von 3 auf 2 was created by MB280
Moin zusammen, 
Ich habe ein 280SE 3.5 -71 Coupé.  
Ich muss die Benzin Pumpe austauschen. Die alte Pumpe hat 3 Anschlüsse und hat ein Dämpferbehälter. Die neue Pumpe laut Dr.D Kompendium bosch 0580464021 (ersetzt durch 0580464042, geht auch hoffe ich?) hat 2 Anschlüsse. Bei mir ist auch ein Dämpferbehälter. Ich hätte gerne ein Ratschlag ob ich den Dämpferbehälter auch für die neue Pumpe brauche oder ob ich den behälter weglassen kann ? 
Noch eine Frage: Das Filter sitzt unter der Haube. Bei der neueren Ausführung sitzt es bei der Pumpe. Kann ich das Filter unter der Haube lassen? 
Danke für eure Hilfe 
Mfg Sven 

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10 Mar 2026 18:17 #24522 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hallo Sven,

der Dämpfer an der Hinterachse dient der Geräuschdämmung und Beruhigung des einströmenden Benzins. Du solltest ihn beibehalten. Ob der Filter an der Hinterachse oder hinter der Benzinpumpe sitzt, ist egal. Er sollte nur hinter der Pumpe sitzen, da die Pumpe schlecht saugen aber gut drücken kann.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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10 Mar 2026 21:37 #24523 by Marinus
Replied by Marinus on topic Benzin pumpe von 3 auf 2
Hi Volker,

Does that also apply to a 250 CE? 
In the 47/1 group with the 3-way pump, there is indeed a damper (92), but in the 47/2 with the 2-way pump, there is only a filter (83) and no damper.

Greetings Marc

 
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10 Mar 2026 23:19 #24524 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hi guys,

obviously damper was eliminated when 250CE switched from 3 flange to 2 flange pump. And it has very special damper. However in R/C 107 (like my 450 SL) and W116 an easier damper was used with 2 flange pump.

When I look at those pictures I believe that the old damper had 3 connections too, while the new one only uses 2.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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11 Mar 2026 00:21 - 11 Mar 2026 00:50 #24525 by nordfisch
Replied by nordfisch on topic Benzin pumpe von 3 auf 2

...
When I look at those pictures I believe that the old damper had 3 connections ...
Maybe they were 4 connections like the damper 'Ausgleichsbehälter' in the first Opel model?
Look at the photos.
There is a massive wall between inlet- and outlet-side.
Since I've first seen this part, I wonder about the benefits / efficency.

 
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Regards
Norbert
Last edit: 11 Mar 2026 00:50 by nordfisch.

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11 Mar 2026 19:31 #24526 by MB280
Replied by MB280 on topic Benzin pumpe von 3 auf 2
For whatever it's worth..
Attached a picture of my damper. 4 connections: 1.from tank, 2.to pump, 3. from pump, 4. supply to engine( filter). 
All connections will be used when changing to new pump( if I understand correctly)

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11 Mar 2026 19:52 #24528 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hi,
well the later version is only on inflow side and has 2 connections. Also nothing inside, just for noise cancellation reasons.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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14 Mar 2026 12:21 - 14 Mar 2026 12:29 #24538 by Marinus
Replied by Marinus on topic Benzin pumpe von 3 auf 2
Hi All,

I believe 4 connections.

See  roland-merz-katalog.de/en/1144700216-dam...al-mb-spare-part-nos

Greetings Marc

 
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Last edit: 14 Mar 2026 12:29 by Marinus.

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14 Mar 2026 12:31 - 14 Mar 2026 22:04 #24539 by Marinus
Replied by Marinus on topic Benzin pumpe von 3 auf 2
Hi all again,

And the very first ones had a box shape i believe?

vdhflipbooks.de/books/WHB/WHB-W114-W115-bis%2073-Gesamt/#238

@ Volker To have properly functioning damping, surely there needs to be a diaphragm between the inlet and outlet chambers, and not a hard wall like in Norbert's picture?
Have you ever seen a cross-section of the first box version dampers or the cylindrical shaped  damper?

 
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Gr Marc

 

 
Last edit: 14 Mar 2026 22:04 by Marinus.

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14 Mar 2026 17:33 #24540 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hi Marc,

no I have only seen the later version for R/C 107 and W116. That has only 2 flanges and is a round box with nothing inside.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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14 Mar 2026 17:39 #24541 by MB280
Replied by MB280 on topic Benzin pumpe von 3 auf 2
Yes, that is the one I have for my 280se3.5

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14 Mar 2026 20:49 - 14 Mar 2026 20:53 #24542 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
That is how later 2 flange version looks like. It is just one half of yours.

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Fuel runs in from the top (flange now pointing downward) and then runs into pump on the right. No holder, it is just fixed in fuel hose. If any of u wants this one, let me know. It is spare...
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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Last edit: 14 Mar 2026 20:53 by Dr-DJet.

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14 Mar 2026 21:18 #24543 by Marinus
Replied by Marinus on topic Benzin pumpe von 3 auf 2
Thanks Volker,

So the fuel goes form the big fuel tank to a very small steel tank (the picture that you are showing with the 2 fuel connections) i asume there is nothing inside no membrane then
How does it damping the noice?
How does it  damping (smooth out) the fuel fluctuations  

Greetings Marc

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14 Mar 2026 23:56 #24545 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hi Marc,

it was calculated by Mercedes-Benz AI Fluid Dynamics. This round box gives a definite left-spin swirl that overshadows the noise and compensates it. 
[img


To be honest: I never thought about it.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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15 Mar 2026 14:15 #24546 by Marinus
Replied by Marinus on topic Benzin pumpe von 3 auf 2
Hello everyone,

Just as Norbert has his reservations, I also have my doubts regarding noise damping and flow equalization.
What I can live with, is that if the pump doesn't handle vacuum or empty lines well, then—for example, if I make a sharp left turn with a nearly empty fuel tank a half "dampferbehalter" (red dotted circle) ensures that the pump still receives fuel.

Greetings Marc

 
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15 Mar 2026 17:52 #24547 by Dr-DJet
Replied by Dr-DJet on topic Benzin pumpe von 3 auf 2
Hi Marc,

that I do not believe. Mercedes-Benz always has a hunting pot (Schlingertopf - some call it Blumentopf) on outlfow area of tank to avoid empty fuel hoses in curved. No need for damper for that.
Viele Schraubergrüße - best regards, Dr-DJet Volker
Alles für den Mercedes-Benz R/C 107 und W116 in der SLpedia Sternzeit 107

Workshops Hzg/Klima 16.5.(ER), D-Jet 11.7.(ER)/29.8.(F), KA-Jet 30.5.(HU), KE-Jet 20.6.(ER)

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15 Mar 2026 18:19 #24549 by nordfisch
Replied by nordfisch on topic Benzin pumpe von 3 auf 2
I agree with Volker.
Other FI-equipped cars do have this internal reservoir pot, too.
FI-tanks and carburator-tanks are different.

Regards
Norbert

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23 Mar 2026 11:55 - 23 Mar 2026 11:58 #24584 by MB280
Replied by MB280 on topic Benzin pumpe von 3 auf 2
Moin moin
[img

Coming back to my pump replacement. The old pump is shorter (and 60 mm diameter) than the new pump. The sleeve(A1244780353) to fill out the diameter is not available any more. That can be fixed somehow. Remaining problem is the fastening brackets/holder for the pump. Since the new pump is longer it does not fit.
Any suggestion of replacement bracket or how to fix would be appreciated. 
Last edit: 23 Mar 2026 11:58 by MB280. Reason: mistake diameter

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