I got one in today for a strong fuel odor and degas bottle overflowing. Brought it in and sure enough fuel and coolant were overflowing out of the cap. The first thing that came to mind was injector cups just remembering that happen on a couple 7.3s. Called the hotline just to make sure i was right because i couldnt find anything in the PCED or workshop manual on this.Hotline said i was absolutley right and told me the best way to check them is to pull all 8 injectors, clean out the bores in the cups, rub palmolive down in the cups , spray them with water to activate the soap and pressurize the cooling system. He said then to look in the bores for bubbles also on the heads for cracks in the castings above the cups.Well my questions to you guys are that the WSM says you have to pull the heads to install new injector cups,Is this true? Also is this what you guys do to find the leaking cups?? Any help or advice always appreciated!