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Your going to need a fuel pressure gauge to run some tests. Hook up the guage, preferably in the morning before attempting to start it and monitor what happens to the fuel pressure. It should come up to spec almost immediately. If it doesn't, you have a bad fuel pump. If it's already hot when you test it and the fuel pressure is normal, shut the engine off and observe what the pressure Does when the engine shuts off. If it immediately starts to drop, see if you can pinch off the fuel "pressure" line while there's still some pressure left and see if that stops the dropping. If it does, that's a bad fuel pump.
This system needs 60+lbs of fuel pressure to run properly. If it has any trouble attaining that, the fuel pump is bad.