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Discussion Starter · #1 ·
Let me first lay the ground work.

I purchased my 05 E46 M3 in Nov of 2016 and the car had been sitting for several months and the battery was dead and needed replacing. I made two bone head mistakes that I’m embarrassed to admit. I connected the jumper cables to the battery in the trunk (not under the hood) and hooked the cables up backwards (red to black and black to red), I know what a bone head! :facepalm:

After realizing my bone head mistake the damage was done. I disconnected the cables, then waited a few minutes, connected the cables correctly and the car would turn over but not start. I searched the fuse box and I replaced the #20 fuse, a 20A fuel pump fuse as it was tripped. After doing this, I was able to jump start the car (while still jumping the car incorrectly). After returning home with the new battery installed, I turned the car off and noticed the fuel pump continued to run (the car fan fine). I now must either remove the negative battery terminal connection or pull the #20 fuse in the glove box to make the fuel pump stop.
I then opened the fuse box/relay box under the hood on the driver’s side. I removed the block of five fuses and checked the center one, a 20A fuse as research lent me to believe it maybe the issue. The fuse did look a little burnt but after testing it the fuse was fine, I replaced it just to be safe.

I’m thinking maybe I should replace the fuel pump relay next, any thoughts?
 

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OEM ///PLUS
2003 M3 6MT Slicktop
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23,390 Posts
yep i'd switch it out with the horn relay next to it. very easy to do and troubleshoot. start with the easiest and move down the line.
 

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Discussion Starter · #4 ·
My research lead me to believe the M3 coupe's fuel pump relay was in the trunk on the passenger side near the strut tower, is there more than one?
 

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OEM ///PLUS
2003 M3 6MT Slicktop
Joined
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23,390 Posts
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