My son has a 325i 2002 and I helped him put a new water pump and thermostat and hoses. Then I told him to take it for a ride soon after the car died he said funny noise then just stopped.I decided to run a code scan and both fuel were lean and bad temp sensor. I then decided to change the fuel filter it was full of black fuel. I then tried the fuel nipple no fuel so I looked at the fuse it was OK so then looked at fuel pump no power at the brown and white with blue line so then went to fuel pump relay and switched with horn still no power. So I then put 12 volts to the pump and it works so I test the fuel rail for gas since I ran the pump for about 30sec but no fuel so I pull the hose at the pump and it was under pressure and now I'm lost? also what does the other unit do behind the drivers seat? that unit has 11.48 volts and very little fuel on that side.Is there something I missed? we put the car back the way it was when we changed the parts.