Well, how did they work 02?

 

well the o ring works, too well. the real problem i have(just found out) is too much pressure in the fuel bowl. So what happened just recently was my fuel filter cap started cracking(3 times in a row). So i thought maybe my fuel pressure regulator is bad, took it apart, and looks fine, but I will install a new one anyways. But since I have it off I decided to take my air house and blow down the return line to see if it wasnt clogged, but I couldnt blow through at all. So I started to take apart my fuel return line one by one and now I got to the tank i have to drop the tank down and take a peek inside.
So in my conclusion is my return line is clogged and its building up too much pressure, its only supposed to be at like 70 psi at most.

 

I was just on the phone with Jody @ DP, yesterday, discussing my ongoing problem. In the course of the conversation, as we were discussing fuel pressure, it came up that a bad/damaged copper gasket on the injector tip could allow combustion pressure to back feed into the fuel system and massively over-pressurize the bowl. It doesn't fit/apply to my situation, but it could be your problem. I think you would need to get a really good fuel pressure tester on there (that can handle hundreds, if not thousands of psi)with a long enough hose so that you can watch it while you're driving, and check fuel pressure with the pump on but engine off, as well as with the engine running.

As far as I know, the pump, even fully unregulated, is only able to generate about 100psi. That shouldn't be enough to crack your cap. If it is, anybody running higher then stock fuel pressure is living on the edge, and you would think we would hear about more cracked caps.
And even if the return was blocked, I would think the pump would just "deadhead" and simply get essentially jammed/stalled internally, and burn up. If a pump is only capable of xxxpsi, it can't just keep going and cramming more and more fuel, to the point of greatly exceeding its pressure capability. At least, I don't think it can