I don't have any fuel leaking out of the vent hose on the FPR, so I'm betting that the FPR hasn't ruptured. I had forgotten about this car having two pumps (whenever you have to change fuel filters its always a fight to keep the banjo connection at the pump closest to the filter from leaking). I've changed a couple of the MAS units on cars that came through the shop, and I have one MAS unit that has a good fuel circuit but a bad A/C circuit sitting around to test with. I've got to find a good connection diagram and hook up the fuel pressure test kit and see how my pressure is running, and check the two pumps and see if both are running if my pressure is low. I lucked out in all the nearly 5 years I owned a 190E and never had CIS issues other than the hoses cracking on the idle air circuit and the IACV sticking and giving me all kinds of heck. I really want to get this car whipped into shape - the body is clean with no rust, all the power windows work, the sunroof works, even the power seats work good. 188K is "young" for these cars. We've got a customer with a M104 W124 with over 340K on the clock with the original engine and transmission.