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Cold starting problems

My new 300zx has a cold start problem. It takes 2-3 longish cranks to get it started. I read on another thread that the fuel pump check valve may be the cause - fuel draining back into the fuel lines. I've tried priming the fuel lines trick (ignition on and off a few times before starting) and that seems to work.

 

So the question is do I need to replace the pump and check valve or can I repair or just get a new check valve? I'm not sure if it's an integral unit.

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