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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, Jun-18-2006, 05:03:40 AM   #1
DreddM3
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Default Possible to clean out gas tank, every so often?

How hard is it to reach and deattach the gas tank on an E46? Considering all the **** that gets built up, removing it every 3 months and flushing it clean would be nice ... possible for DIY?
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Old Sun, Jun-18-2006, 02:46:24 PM   #2
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Yes but it is a lengthy job. You need to remove a lot of stuff to get it out. Do the Turner subframe reinforcement plates while you are at it.
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Old Sun, Jun-18-2006, 04:14:29 PM   #3
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I think this is just a tad bit extreme.

Don't waste your time. BMW wouldn't design a car that would need this.
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Old Sun, Jun-18-2006, 05:22:35 PM   #4
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I havent been under the car yet.....but isnt there a drain plug? This way you dont have to remove the whole thing. I would think if you removed the plug, any fuel that dumps out should drag out some debris, although not all of it, enough to keep it relatively clean enough.
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Old Sun, Jun-18-2006, 05:34:29 PM   #5
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no drain, as far as I can tell from the parts pic...

but I doubt there is much stuff in there...it gets mixed up (solution & suspension) as you drive and is pumped out, and caught by the filter...

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Old Sun, Jun-18-2006, 10:29:01 PM   #6
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I've read on multiple occaisions of peoples fuel pumps failing because of running the tank to low and clogging it with the debris... replacing a fuel pump isnt extreme... but I've also read that it can mess with your injectors, and other engine components... and those are expensive.
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Old Sun, Jun-18-2006, 11:25:38 PM   #7
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Quote:
Originally Posted by DreddM3
I've read on multiple occaisions of peoples fuel pumps failing because of running the tank to low and clogging it with the debris... replacing a fuel pump isnt extreme... but I've also read that it can mess with your injectors, and other engine components... and those are expensive.

the pump is most likely a positive displacement type...so it's got clearence to pass dirt, which will be caught by the filter...nothing should get to the filter, as it gets dirty (higher DP drop) the regulator mounted to it keeps a constant pressure...

the storage tanks at the station act as settling tanks, and let what little crud in the gas, fall out...the pump pick up is off the bottom of the tank so it's not sucked in...that's why I won't buy gas if I see a tanker filling the tanks...stirs up the sediment

I had to clean the level sending unit in my e36 M3, pulled the rear seat and removed the sender...no crud in the tank at 150k miles or so...

new tanks are plastic, on older metal tanks, with crapier gas, rust & scale over a long time may be a problem...not really anymore...
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Old Mon, Jun-19-2006, 03:51:44 AM   #8
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Quote:
Originally Posted by ArtM3
the pump is most likely a positive displacement type...so it's got clearence to pass dirt, which will be caught by the filter...nothing should get to the filter, as it gets dirty (higher DP drop) the regulator mounted to it keeps a constant pressure...

the storage tanks at the station act as settling tanks, and let what little crud in the gas, fall out...the pump pick up is off the bottom of the tank so it's not sucked in...that's why I won't buy gas if I see a tanker filling the tanks...stirs up the sediment

I had to clean the level sending unit in my e36 M3, pulled the rear seat and removed the sender...no crud in the tank at 150k miles or so...

new tanks are plastic, on older metal tanks, with crapier gas, rust & scale over a long time may be a problem...not really anymore...
awesome info once again. thanks.
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Old Mon, Jun-19-2006, 04:24:55 AM   #9
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Quote:
Originally Posted by DreddM3
How hard is it to reach and deattach the gas tank on an E46? Considering all the **** that gets built up, removing it every 3 months and flushing it clean would be nice ... possible for DIY?
Are you looking for something to keep you busy? Ever hear of a fuel filter?
This is a very difficult and messy procedure and I assure you if you accomplished this once you would not attempt it again, much less try it every three months.
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Discussing Possible to clean out gas tank, every so often? 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)