Fuel Pump?

[TheEngineer]

I have this fuel pump on the left side of the engine, mounted behind the fuel filter on the engine support arm. It looks like a normal fuel diagphram pump but I can't see how it is driven. Usually these pumps have a plunger or a lever which is actuated by the cam shaft. It moves the diagphram and thereby pumps fuel. But on my engine I can't see any drive mechanism. I'm just curious: The car runs fine and I'm not going to take it apart just to study it. Does anyone know?

'69 280SL,Signal Red,007537,tired engineer, West-Seattle, WA

[graphic66]

I believe you are looking at the fuel damper. It smoothes out the pulses in the fuel system. At least I think that is what it does.

[George Davis]

If we're all talking about the same thing, Graphic66 is right, it's a damper.  I HAD to take it apart because I thought it was a check valve, but it's not, it's a damper and that's all.  Simply a heavy diaphragm, probably outlast the rest of the car.

George Davis
'69 280 SL Euro manual

[TheEngineer]

Thanks Guys! Much appreciated.

[ja17]

Hello Guys,
Yes a dampner it is. I believe it's purpose was to reduce surging fuel noise in the fuel feed system.

Joe Alexander
Blacklick, Ohio