I've recently replaced my fuel pump on my W202. The one I replaced seems to be the one that was installed in the factory as it has the MB logo and is made by Pierburg. The new one is from Bosch. In fact, I replaced it because it was making some kind of high voltage noise in the car and now it's gone. What I want to do is disassemble the old pump and see what's inside and maybe try to fix it. But I can't figure out how to take off the outer metal shell. Has anybody been able to disassemble this kind of fuel pump? Here's how the fuel pump looks: [![enter image description here][1]][1] [1]: https://i.sstatic.net/nvBUy.jpg   