3406B fuel pump?

On the back of the pump, just below the fuel pump solenoid there is a screw with lock nut. Is that one of the idle screws? reason I'm asking is have a small bit of oil seeping out, and that screw is out kinda far, need to turn it in to stop the seeping. Truck is coming off recent motor job, and they re-sealed my fuel pump, did not change fuel adjustments, but that screw is out further then where I had it. I need a re-fresher on what that screw is before I play with it.

 

Thanks, I don't think I've ever had to touch that screw. I'm just gonna turn it a hair to see if I can stop the seeping. If it messes with my idle I'll just put it back to where it was b/c it's not a bad leak or anything. Everything is all freshly painted and looking nice want to keep it that way.

 

Just researched dash pot screw and it has something to do with the deceleration of the fuel pump which makes sense on why I've never had to adjust it. Thanks for the input.