Need help identifying part 88' s-10

Hey yall, I am trying to identify a part on my grandpas 1988 s-10. I am not familiar with this vehicle at all so I thought I would just ask on here.

https://www.dropbox.com/s/hepexx4hznl8les/2014-04-26%2009.38.38-1.jpg

https://www.dropbox.com/s/542g2jb7p5ey16x/20140426_093838.jpg

Tough to see the true location, is this on the transmission? If so, vacuum modulator.

Its on the drivers side front lower portion of the engine and it has a fuel line attached to it on one end then its bolted up to the engine.

What engine is this, if there is a fuel line and a fuel line out this could be the fuel press. regulator but on a 6 this is not where it is located.