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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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Old 10-01-2007, 11:04 PM
sydways e30 sydways e30 is offline
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Location: new zealand
Join Date: Oct 2007
Posts: 3
Mein Auto: nz new 320i 4dr race car
fuel pump problems

hey guys. i gotta pfl 320i and i have just converted it to a fl 325i with motronic v1.3 i need your help as i tried to start it and there was no power to the fuel pump. i hooked it up to straigh 12v and it worked but when i tried to run it just completely flooded the engine. i noticed that there are 2 wires coming off the fuel pump positive terminal. can someone please tell me where they go or send me some wiring diagrams and does anyone know what the fault could be? cheers oli
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Old 10-18-2007, 07:06 AM
hrlyrdr81 hrlyrdr81 is offline
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Location: Littlestown, PA
Join Date: Oct 2007
Posts: 6
Mein Auto: 1992 318i
I have been struggling with a fuel pump issue on my 318i as well. I can tell you what I have learned, maybe it will help. There are two wires coming off the fuel pump, one is ground the other goes to fuse 11 on the panel just in front of the firewall. From the fuse it goes back to a relay also right in front of the firewall. Remove the wiring harness cover and you will see three relays, the center one is the fuel pump relay. The relay is "turned on" by the DME Motronic control.

Check the fuse, and check for continuity from the fuse to the fuel pump. You can test the relay, unplug it and apply voltage to terminals 30 and 86 and ground terminal 85. you should hear a click and there should be voltage at terminal 87. If all these test ok your problem could be any of the sensors that the DME monitors, fuel pressure sensor, air temp sensor etc.

Good luck!
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