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Originally Posted by stevebfl
Its just too bad there are so many poor translations in the parts book. You will be better off knowing how it works than reading parts books. If you surmise that it is a fuel pressure regulator, just what pressure would you have it regulate. Look at the diagram. It is in the fuel return after the frequency valve. About all it can do there is be a diaphram that acts as a regulator of pressure pulse noise. So, yes it is a diaphram and it is a regulator but the translator just wasn't a tech. It regulates pulses that cause noise.
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steve i don't want to turn this in to a pissing contest, but i have been exclusively repairing mercedes cars for the past 15 years, i know the functions of the units, if i have offended you i appologize, i would believe that mercedes know what to call there own parts, they do sometimes give them som odd names. most pressure regulators are in the fuel return system, look at the 104 ME engine as an example, is the pressure regulator in the return or supply?