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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Sep-16-2018, 01:51:07 AM   #1
Black92BMW
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Default Mouse or something ate through my sending unit. Anyone had rodent issues?

I have been parking my car outside this season. I drive it to work M-F and then it sits most of the time over the weekend while we use either my truck or the wife's car. I don't fill up with gas very often, since my trip to and from work is about 10 min.

It had been about 3-4 weeks since I last got gas in the m3, so I decided to use it to take my son to a birthday party. We stop on the way to fill up with about 14.5 gallons of fuel, when this happened:



Trying to do a little math in my head based on where the fuel gage was, how much I put in, and by how much was on the ground (picture doesn't show it following the concrete seems) it was probably 2-3 gallons. Since it was the opposite side of the car, I didn't notice the leak until the unit clicked off and I walked around to get in the drivers seat.

I notified the gas station attendant and they ended up calling the fire department after they saw it running down the parking lot. At that point I figured I better have my wife come and pick up my son while I call and wait on a roll back. I assumed it was vent line or something that popped of or gave way.

Doing most of my subframe reinforcement myself, I know how how much of a pain it is to get to the top of the tank and any of the lines. Once the car was dropped off at home, I decided to see if I could find from what line it was leaking by the drivers side access panel. I found this on top of the jet pump sending unit:



After clearing the fuel soaked nest away, this is what I found underneath:



Nice little hole chewed by some furry critter

Checked the fuel pump sending unit and after clearing out more nest materials, I had the "pull tab" chewed away:



Ordered a new drivers side sending unit and after I reinstall, I am cutting little butter sized chunks of the green brick tomcat mouse poison to stick on top of the units.



R.I.P you little bastards!


Google photo's apparently sucks for deep linking, so here is the album for anyone who has issues:

https://photos.app.goo.gl/8BHkKxdrNrNbWHBMA

Last edited by Black92BMW; Sun, Sep-16-2018 at 02:24:12 AM. Reason: Added album link
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Old Sun, Sep-16-2018, 02:12:57 AM   #2
mpower22
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Default Re: Mouse or something ate through my sending unit. Anyone had rodent issues?

man, definitely a random spot and embarrassing story at the gas station. The first two images are blocked for some reason, but I'm using Chrome.

I have seen two other M3's recently with under hood issues, particularly getting into the hood insulation. The Tomcat poison really works well, I've used it in my garage and had fantastic results. But yeah, looks like mice to me. They can squeeze into almost any area, regardless how small it is.
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Old Sun, Sep-16-2018, 02:26:05 AM   #3
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Default Re: Mouse or something ate through my sending unit. Anyone had rodent issues?

Uhg. Sorry, man. Never with my M3, but I had squirrels gnaw on the spokes of the wheels on my LR4 when it was brand new, over the course of an autumn. It was bizarre - but the damage was permanent. Every spoke, gashes that fill up with dirt immediately and look horrible.
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Old Sun, Sep-16-2018, 02:29:43 AM   #4
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Default Re: Mouse or something ate through my sending unit. Anyone had rodent issues?

Quote:
Originally Posted by mpower22 View Post
The first two images are blocked for some reason, but I'm using Chrome.
Apparently deep linking from google photos is buggy the way I did it. I fixed them and added an album link for anyone that does have issues.

Yeah, was kinda embarrassing, especially since it wasn't washed and looking all pretty. LOL
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Old Sun, Sep-16-2018, 06:45:09 AM   #5
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Default Re: Mouse or something ate through my sending unit. Anyone had rodent issues?

I take you dont drive the M3 often?
Hopefully when they get a nice bite of that tom cat they crawl away and die elsewhere and not inside the car. Stuff definitely works and is a go to for my lawn mower shed, at least when I canít grab my shovel in time (sorry to those peta guys on here
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Discussing Mouse or something ate through my sending unit. Anyone had rodent issues? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)