I'm installing a new Kirban adjustable fuel pressure regulator, and I can't get the damn thing to stop leaking. The o-rings look fine, I've oiled them up when installing, and even switched the o-rings from the stock regulator, damn thing still leaks. I can put the stock one back on and it works fine, doesn't matter what o-rings are on it. Do I need another type of gasket? The gasket for the other port was just a small ring that goes at the base, could that be the problem? Thanks is advance!