2003 bmw 325 i - started but sounded bad, ck engine light came on
When I backed it up and you could smell fuel. Car did, I got it restarted, but parked it in the drive way and turned it off. Fuel smell is really strong - does this sound like a fuel pump issue or something else.
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first verify the basics--fuel and spark. If these are present, then timing. It may be your crankshaft position sensor. A scan would help verify but with the car not starting, you would need someone to bring a scanner to the car...
The check engine light could be any number of things and the only way to find out is have the codes scanned. The brake light issue is common on E46 3 series. It is an issue were the brown ground wire that goes into the lamp housing melts at the connector causing a loose ground connection. The connector needs to be replaced and also add additional grounding wires to prevent further issues. And for fuel additives either use the cheveron techron, or the bmw fuel additive(the bmw stuff is the exact same thing, so just use which ever is cheaper).