Fuel Filter or what?

[gable74]

So I'm changing the oil in the truck today and notice what looks like an electric fuel pump and filter on the rail. Weird cause I have never heard it run but I went in for a closer look. Sure enough its an electric pump and filter right before it. I took a picture and kept moving with the oil change and lube. I didn't check to see if there was still a stock pump on the block but I will do so tomorrow. I just assumed I had a mechanical pump cause I never had a reason not too, but now I'm not so sure.....LOL. Anyway, while I was under there I noticed another weird looking part in front of the pump I had never seen before. Anyone know what it is? Is it a post-pump filter? Second picture is just the filter and pump I never knew I had...lol.