If the E46 330d cranks but won't start, check the compression.

[Inspirli]

I'm a bit worried about this 330d 184hp car since it won't start. With the ignition on, I can hear a loud buzzing sound coming from the fuel pump under the hood, and I can see petrol running to the Hffp. Someone has torn out the glove box and opened the fuse box, and there's another one under the hood. The person from whom I got it said that it may be the ecu, but I'm not sure. My codes range from 1260 to 1E00.
Thanks in advance for any guidance you may provide!

[Starat]

A low fuel pressure signal could be shown if the saddle tank's lift pump fails.

[Starat]

It may be due to insufficient battery power if there is no CAN-bus.

[Inspirli]

I will get it back up and running in a few days, examine the live data, and see if any more codes pop up; I think I eliminated some of them.

[Markwe]

If it runs for a few seconds on brake cleaner or easy start, then fuel hunger is the problem.
It was only a notion.