M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Electrical => Topic started by: curtis on July 16, 2007, 10:19:06 AM
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i was driving home the other day and my car up and died in an intersection. had it towed home and tore into it. found out i wasnt getting fuel, so i pulled the fuel pump thinking it was bad. i hooked it up to a battery and it turned on just fine. all my fuses are good, so would that mean that my fuel relay is bad? also, when i turn the key to the on posotion, i dont hear the usual sound of the fuel pump presurizing the system. if anyone could help me that would be greatly appreciated.
thanks
curtis
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Check the fuel pump relay. You can jump it @ pins 30 and 87.
G. Luck
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and if it turns on when i jump it then its definetly the relay?
thanks
curtis
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i just tried jumping it and nothing happened. i didnt hear the fuel pump. what else could it be?
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1. Check fuse 11, make sure it is not blown. If it is blown, replace it and keep an eye on it. If it blows again, you have a problem you need to resolve.
2. Remove the rear seat bottom so you can definitely hear the pump.
3. Jump the relay. Make sure you are jumping the right pins on the right relay - as our Georgian friend pointed out, pins 30 and 87. Should be a red 2.5mm wire (~12ga?) and a green/violet wire, 1.5mm thick. I use a switch with leads to straight pin connectors, so I can jump the two connections and turn the pump on and off. I actually carry this in the glovebox, just in case... if you have a relay die, you can use this in an emergency to bypass it.
4. With the relay jumped, check for +12V at the fuel pump pigtail.
- If you have +12V at the pump, but the pump doesn't come on, then it's probably the pump.
- If you have +12V and the pump does come on, it's probably the relay.
- If you don't have +12V, even with a jumper in there, you have a break in the wiring somewhere between the relay and the pump connector. Start chasing wires.