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.