Just realized I posted this in the wrong section. Here goes again.

 

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.

dont know much about that valve im afriad although there look to be check valves downstream of the fuel filter so it might be independent of the pump and quite an easy job.

 

Have you ruled out other causes such as old or dirty plugs, MAF problem, slight flooding of the engine?