well I dont even think I have to do that. My lines in the intake there are new so I can see the fuel traveling in them and it goes in the high pressure side and goes right back out the return.. lol. So since the place where I baught it didn't have one to exchange with i have to wait a couple days. I put in my old cpi after I cleaned all the tappets. I checked for leaks before I buttoned it up and found its holding 60psi. I put it back together and so far so good. I have my fingers crossed. I took off the valve on top of the plenum and looked in there after it ran an hour and there is no sign of anyting puddling in there. I guess when I replaced that thing it was for no reason. lol. I hope all is good now.