Originally Posted by salto
Could it be that the thickness of the proseal after removing the supplied gasket is a critical measurement. I made sure I had a flange seal thickness that was reasonably generous. Didn't have issues with rib interference.
I don't think so. I had to add "V" bends to both my sender arms to get clearance from the rib: on the second go-around I even shortened one of the arms a bit but still had some interference. And I did the same with "generous" sealant. Of course, when fitting the arm, it's hard to get "just right" standoff since sealant is the last thing done. I wanted to be SURE than when I seated the sender with sealant I would be good to go: this is more critical with QB tanks (my case) than if the arm is fitted before closing up the tank.
I had another issue as well: the right tank sender was a little "stiff" - didn't want to freely move up/down with gravity alone. I futzed with it a bit and finally ordered another from Summit Racing which was fine.