I've been running my regulated fuel return for awhile and it's been great. The gauge on the regulator has shown me that my pump has died so I've bought a new pump and installed it. Before I put the new pump in, the needle would dance around 30-40PSI and all sorts of goofy things. With the new pump, it shoots right up to 20PSI and stays there... BUT, my truck has the spunk back that I had before the pump went out and it feels like it used to. So, I think something MIGHT be up with my gauge. It's a liquid-filled Summit gauge rated for 0-100PSI. When I first installed everything, it read 60PSI which is where I wanted the regulator at. I noticed when I got that gauge there was a little set screw in the end of the NPT fitting. What's up with that? Summit said to leave it in there, but I think that the pressure on my lines may have caused the screw to screw itself all the way in and now the gauge won't read right. It was just in there loose when I got it... does anybody know what it is? If so, what am I supposed to do with it? I would think I'd need to take it out... if that's the case, then my old pump might not have been bad. But then again, it was humming really loud, it's chirp and cough occasionally as well. Anyways, anybody got a clue what that set screw in the end of my gauge is? I also am gonna check the regulator. I doubt anything is wrong with that because just a couple days ago, I know it was open enough to let more than 20PSI flow through it. Thanks, guys... POST UP!!!