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/// That would make it a fuel problem. One of two possibilities. Either the check valve is seeping allowing gas to run back to the tank or an injector is draining the fuel rail after you cut the engine off. The delay is the time required for the fuel pump to bring the pressure back into the operating range. I can't give you the full test set up for the 700. Generally this is what you are trying to do.
Pull the rail and all injectors, leave them connected and supply a ground, put each injector into a container you can see through, remove the high voltage, crank several times for a short period, look for injector drip.
You can also rig a remote switch for the fuel pump relay's switch contacts. I don't know the pin numbers for your car. (remove the relay and plug the custom wired switch into the correct relay socket connectors) While you must crank to get the injector signal from the electronics you are looking for a leaking injector and just the fuel pressure from the running pump should reveal the problem. If you do not short the fuel pump relay switch, remember that normally the fuel pump relay only runs for a few seconds before switching to the engine running signal from the electronics.
The check valve is in the main pump output fitting. If you have noticed other fuel related problems, difficulty climbing hills, dificulty on less than half a tank, there might be trouble with the strainer, or the short hose on the intank pump, allowing trash to get to the check valve. The main filter is after the check valve.
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