My 330Ci won't start: fuel pump, relay and fuse all ok

Ive checked a lot of things trying to get to the problem here but i just dont know what to fix anymore. All i noticed was that there is no power going through to the fuel pump when i put the key on position 2. If i connect the pump directly to the battery it works. Ive swaped relays under the glove box but all the same, nothing works, also i noticed there is no power going to the air flow meter sensor when i turn the key on. I had connected a small wire drawing power from the airflow sensor connector to run the fan, could i have blown something here?

We need a bit more information. I assume this is a crank/no start? Have you been running the fan off of the MAF power source for a while? I don't know why you would do that, I think it gets 5V and you need a consistent reference with no external load for the car to run properly. You probably blew a fuse, have you checked all of the ones associated with engine management?

Well the electric fan was running nonstop cos the electric switch was faulty. My girlfriend wanted to use the car and she knew nothing about temperature gauges in case the fan wasnt connected and the car iddles at stand still. So to prevent damage by overheating the engine i needed a power source that would kick the fan if i run the engine and stop if i cut it. So i disconnected the airflow meter plug and drew power from it to the fan. It worked just fine a coupke of times the same day then suddenly no start, fan doesnt run, when i turn tbe key on i wasnt geeting power to this plug, no power to the fuel pump. Checked fuse in the glove box and it was fine, checked and even swapped relays, they were fine, checked pump by directing power to it, it worked. I know its a fuse/relay/switch somewhere that burnt but which one and where? And the fault code scan returned P0006: fuel shutoff valve: a control circuit low

Originally Posted by MorganMckeys

Well the electric fan was running nonstop cos the electric switch was faulty. My girlfriend wanted to use the car and she knew nothing about temperature gauges in case the fan wasnt connected and the car iddles at stand still. So to prevent damage by overheating the engine i needed a power source that would kick the fan if i run the engine and stop if i cut it. So i disconnected the airflow meter plug and drew power from it to the fan. It worked just fine a coupke of times the same day then suddenly no start, fan doesnt run, when i turn tbe key on i wasnt geeting power to this plug, no power to the fuel pump. Checked fuse in the glove box and it was fine, checked and even swapped relays, they were fine, checked pump by directing power to it, it worked. I know its a fuse/relay/switch somewhere that burnt but which one and where? And the fault code scan returned P0006: fuel shutoff valve: a control circuit low

You are a danger for the health of your own car.
Which wires in the MAF (air flow meter) connector did you connect the fan?
Never mind. Check fuse #3 (20 Ampere fuse) in this link.

http://www.chitownm.com/forums/showthread.php?t=4284

Did you chek the fuse inside the engine bay

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Thanks guys for all pointers, it was the fuse in the engine bay, i had checked them before but wat i didnt realise was that if its blown only one side would show no power while the other shows power available. I re-cchecked them and there it was, blown. I replaced it and my car breathed again!! Woohoo!!

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