Starting Issue, 1974 280 SE

Hi Norbert,
Hard to see how they translated reservoir or container to damper cage. Just for fun, I checked this on a German site that has both english and german part names:

www.online-teile.com/mercedes-ersatzteil...tem.html?language=en

(You can change language in top right corner)

On our 107s, there is just an inlet and an outlet. One side of the "can" does appear to be a diaphragm that would act to dampen pressure fluctuations. I believe that some of the later K-jet 107s as well as cars with L-jets have a return line to the device. They then have three nozzles.

I haven't been near the car for a week, I'm feeling better already!

It appears my car is equipped with two "Dampers" though I wonder if we are getting confused between "Damper" and "Pressure regulator." The pressure regulator I have included in the first image.

Hi Carl,
your car is great...

I marked the first picture. The regulator must be situated in the pressure line as I marked.
Ich habe dein erstes Foto markiert. Der Druckregler muss so angeschlossen sein, wie ich es dargestellt habe.



What you call 'damper' is just a reservoirs.
Was Du 'Dämpfer' nennst ist ein Vorratsbehälter.



Regards
Norbert

Hi Carl,

it is correct. Your car has a small black box as damper from tank to fuel pump. And another damper in return line to tank after pressure regulator. It is wasy to differentiate pressure regulator and damper. Pressure reugulator in your car has 3 hose connectors, damper only two. I still do not know why damper in return line has a screw and what you adjust with that.

However there are also pressure regulators with you one connector on top and one on buttom. BTW last year I had a lot of trouble with the fule hose between pressure regulator and damper. In 8-cylinder this is s very short hose that is bent by 90°. It worked well for 5 years, then finally it got weak and closed return line (exactly on the day I wanted to use my car for my 1st D-Jetronic workshop).. Fuel pressure of course went up and my car ran very bad. I replaced that hose by a preformed hose form Baby-Benz W201.

Carl,
If there is any confusion, it is the the translation Mercedes used for the pump suction damper. They call it a "damper cage". Could have been, say "damper/reservoir" indicating it performs two functions ?? It is there to dampen both pressure fluctuation in suction line as well as reduce pump noise and possible vapour formation. There are many patents on such devices. The one below is used on a kjet and some mercedes diesels. It has a more obvious diaphragm and also includes a fuel return port.
www.ecstuning.com/ES1663654/

Hallo again,

'Dämpfer' ist der Begriff, den Mercedes verwendet. Für mich enthält dieser Begriff aber den Hinweis auf ein technisches Element, das dämpfend wirkt.
Ich erkenne auf dem Bild eine Dose, die mit Hartlot verlötet ist. Die dazu nötigen Temperaturen schließen aus, dass da drin eine Membran verbaut sein kann.

Mercedes kann diesen kleinen Tank (Reservoir, Vorratsbehälter) natürlich nennen wie sie wollen - aber für mich ist ein Tank ein Tank und ein Dämpfer ein Dämpfer.

- Mittlerweile habe ich wohl herausgefunden, warum die Dämpfer teilweise einstellbar sind. Sie sollen ja bestimmte schwingungen mildern, die um einen bestimmten Druckbereich herum auftreten.
Für andere Druckbereiche (z.B. L-Jetronic) brauchen die Dämpfer daher eine andere Grund-Vorspannung.

'Damper' is the term used by Mercedes. For me, however, this term includes the reference to a technical element which has a damping effect.
I recognize in the picture a can that is soldered with hard solder. The necessary temperatures rule out that in there a membrane may be installed.

Mercedes can name this small tank (reservoirs) as they want, of course - but for me, a tank is a tank and a damper is a damper.

- Meanwhile, I have probably figured out why the dampers are partly adjustable. They are supposed to alleviate certain vibrations that occur around a certain pressure level.
For other pressure levels (e.g. L-Jetronic), the dampers therefore need another pretension.

Norbert