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The gizmo is a differential pressure transmitter for the STE/ICE diagnostic system. Unless you have the STE/ICE reader, its worthless unless you want to monitor pressure drop across the fuel filter and want to set up a custom interface to be able to the read it.

Wow sounds like a major PITA. I haven't heard of crap getting to the injection pump through the filters. The stock felt Mercedes fuel filters do have a good reputation of stopping anything from getting to the injection pump. This filter arrangement was used for decades on multiple engines and...

My vent was full of paint. I tried various chemicals to clean it out but the paint is pretty tenacious. The vent is aluminum so I couldn't go real aggressive. There is manufacturer name cast in the valve and with some google searching I found an exact replacement. Unfortunately it was early on...

If its truly an intentional coating, I don't think biodiesel will clean it out. Biodiesel acts like soap (glycerin a very polar molecule is an annoying byproduct of making biodiesel). Polar molecules are great at attacking old grease and crud but not so good with a coating designed to resist...

One thing not to do is use any biodiesel before you get a handle on this. It acts as a solvent on the crud that builds up in fuel systems and will clean it out eventually but in the short term it will add to the pain. My 1300L also has crud in the fuel system from sitting in a depot somewhere...