Paveltolz, Nice shot of that filter. It hides on the back side of the injection pump. You need to crawl up on top of your raidiator and look around the back side of the pump. I like pictures also.
I never had any issues with no filter, but I still threw a ferrite bead filter over the wires. You can get small ones for like $3 to go over the two power wires or larger ones for $5 to go over all the lines. They snap over the wires. These are the things that go over long USB or other PC cables.