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Don't forget that there is another pressure relief on the filter itself that bypass the filter when it is clogged or the oil is too thick due to aging or cold weather! Carlos Reis

Thanks for the reply(s). As far as I have understand, the piezo works like a capacitor and the feed circuit "discharge" it at the end of each cycle in order to close the injector. Did I got it? Thanks Carlos Reis

Hello I connected my scope to the two wires of a Siemens piezzo diesel injector. One chanel reading voltage and the other reading current with a current clamp. I get voltage growing around to 50v, stepping up and then falling to zero (This is normal). In exactly the same time, current starts...