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It would be the high pressure pump if it is indeed the pump causing the problem. It looks like that P228c code can occur anytime the fuel pressure is lower than the PCM expects though. Could be an injector that isn't closing fully, a faulty fuel pressure regulator, or any other leak in the system after the pump. What did you take apart in order to install the kit? I'd review all of that. Have you tried running gasoline since installing the kit, and does the error throw when running on gas?
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