Starting Issue, 1974 280 SE

Hi Norbert. Seems not all manufacturers installed the damper. I believe it is there to even out pulsations caused by injectors firing as well as from roller positive displacement pump.

To add to confusion, we also have a damper between the fuel tank and the pump suction. For unknown reasons, Mercedes call it a "damper cage" . Maybe it's a translation problem? This one is of different design, but likely serves a similar purpose.

Never heard of damper causing any running problem, but some have rusted and leaked.

Hi Graham,
my car (Opel Diplomat E 2,8E, late model) doesn't have any damper installed originally.
Some users highly recommend the installation of a damper because the engine running 'smoother' with a damper installed. I don't intend to install one - my car runs smooth without the damper and another part installed means another part could go defective...

The early cars of my car-model had installed the damper near the tank you call 'damper cage' , 'Ausgleichsbehälter' in German, translation would be 'reservoirs'.
This reservoirs-damper ist known to make problems. It has 4 hose connections - both the fuel-line-side and the suction-side-line fuel flows through, divided by a diaphragm. This diaphragm can get leaky - the reservoirs now being a bypass between fuel- and suction-line. No fuel pressure anymore, engine running no more.

Regards
Norbert

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.