My 2001 330i had been running rough and losing power for the last 2 or 3 days. The only codes I got were bank 1 and bank 2 lean (p0171, p0174). I thought the intake might be gummed up, so I put some seafoam into the gas tank with about 1/4 tank of gas. I drove about 4 miles, car still ran rough, and then I stopped to fill it up.

I filled up the car with premium, started it, it drove about 200 feet and died. I got it towed home, where I first replaced the fuel filter/regulator. That didn't do anything so I looked at the fuel pump and it isn't running. I checked the fuses and relay for the fuel pump and they are fine.

Do you think the fuel pump is the problem, or do you think I have an electrical issue elsewhere?

I'm just not sure that it is the fuel pump because I have never heard of them going slowly. When I have heard about them going the car runs fine, and then it won't run at all. Whereas in my case the car ran rough for a few days, and then wouldn't go.

Any thoughts?

Are you checking pump operation while cranking over the engine? The pump only runs when the DME sees engine rotation.

The fault codes and rough running are consistent with an intake leak, failed CCV, or contaminated MAF.

I am checking with the engine rotating. I did a little further diagnosis and am not getting any power at the fuel pump plug. However, the relay is ok (I switched it with the horn relay and the horn still worked), and the fuses are ok (swapped fuse 54 with a spare, and visually inspected the fuse #3 under the hood).

What else could it be?

Dow you have spark with the engine rotating? If not I'd suspect that both problems are related. That could be a problem with the DME or no timing reference data to the DME.

Update - Turns out it was the fuel pump. Being a dummy, when I pulled fuse #54 to check it I didn't put it back in the right spot, making it hard to diagnose.