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Message: [QUOTE="PowerstrokeJunkie, post: 157281, member: 230"] The oil side of the injector is running at 500-3000psi at all times, which means if there was a leak between the fuel side (40-50psi) and the oil side, the oil would flow to the fuel side and actually enter the fuel side of the injector, eventually making it's way out of the tip of the injector and into the cylinder. This will cause blue smoke when cold until the engine heats up some. Like said above, when cold everything is smaller and the o-rings are stiffer, once warm everything swells up some- i've seen it happen on cold leaking triton v10 manifolds, they are fine once warm. Your problem is probably similar to this idea. I dont see how the fuel filter will turn black on a stock dead-head fuel system, once fuel leaves the bowl and travels to the head it won't go back to the fuel bowl. Your issue is probably the o rings, and you have to pull the injectors to replace them, you want more power- sounds like a no brainer. [/QUOTE]

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