Why does the 3.0 X5 flood out?

[davesx5]

So... what is this sign of?
This is the second time in the past year of owning this car that it has flooded out.
I go to start the car and it fires for about 1/2 sec. (It always fires right up) I start cranking the car and smell gas. This time I tested fuel pressure and have 50psi. While cranking the car it almost starts but doesn't. I hold my foot to the floor and start cranking, after 30 or 40 sec it slowly starts firing on 1 or 2 cylinders then finally hits on all 6.
So whats going on? Do I need new plugs? The cars runs and idles great, mileage is about 20 to 23 mpg.No codes.

[upallnight]

You could have an injector or injectors that are sticking open and flooding the cylinder(s).

You can perform a leak down test by connecting a pressure gauge at the rail and see how long it takes to leak down the fuel pressure.

[davesx5]

I can put the gauge on for a few days, see what happens. I might throw in a set of plugs in the next day or so. I am in the middle of swapping out a engine in my ML350. I don't like it when I have 2 cars down.

[davesx5]

I left my fuel pressure tested on for the last few days. The pressure held good. I spoke with my local BMW mechanic and he recommends new plugs. That's a easy fix, I hope.