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Old 01-04-2020, 03:09 PM   #1
paraklas
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Anatomy of OEM Fuel Pump

Thought I'd share some pictures of the OEM VDO/Siemens fuel pump taken apart. The brushes of this pump were near end of life and I had changed it about years ago, it was the factory pump.

I had no idea that petrol passes through the entire motor and brushes area. this means that the pump is lubricated/cooled by petrol nomatter the fuel level..

Removed the external shell with a cutting disk. rest can be taken apart by hand.































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Old 01-04-2020, 03:16 PM   #2
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I had no idea that petrol passes through the entire motor and brushes area. this means that the pump is lubricated/cooled by petrol nomatter the fuel level..
interesting, thanks. this must be how i killed the pump with low quality gas/petrol years ago.
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Old 01-04-2020, 04:02 PM   #3
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Old 01-04-2020, 04:05 PM   #4
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Old 01-04-2020, 06:13 PM   #5
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It is weird to think that these electric pumps are totally submerged in fuel. Seems an empty tank would wear it out quickly.
Hint to the SULEV cars still under warranty!
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Old 01-10-2020, 10:48 PM   #6
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Wow, cool. I just replace my pump and filter, car has 236,000 miles on it and the change in performance was drastic. I also got new upstream O2 sensors but decided not to use them just yet because the engine feels so much better I dont wann eff with it right now.

My new pump and filter made a huge difference in performance, just as much as new B6 dampeners on the corners.
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Old 01-12-2020, 07:11 PM   #7
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If the pump is lubricated by gasoline, which is a pretty poor lubricant, I wonder if the life of the pump could be extended appreciably by adding a small amount of two-stroke oil to the fuel. I think a small amount would be tolerated by the cats.
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Old 01-12-2020, 07:42 PM   #8
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If the pump is lubricated by gasoline, which is a pretty poor lubricant, I wonder if the life of the pump could be extended appreciably by adding a small amount of two-stroke oil to the fuel. I think a small amount would be tolerated by the cats.
It needs coolant far more than lubricant.
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Old 01-12-2020, 11:04 PM   #9
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Adding any oil to the gas in not a good idea ! I don't believe there would be any measurable increase in fuel pump life but over time there will be many problems with other items related to the fuel system. BMW is not alone with this fuel pump arrangement - pretty standard in the industry.
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Old 01-13-2020, 01:32 AM   #10
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Fuel pumps are designed to use the gasoline as both the coolant and lubricant.
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Old 01-13-2020, 02:56 PM   #11
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The weak link of these pumps are the brushes and commutator. Could the OP remove the brushes to show their length and the rotor's commutator condition? They could easily use brushless motor instead and it would last longer than the car.

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Old 01-14-2020, 03:46 AM   #12
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The weak link of these pumps are the brushes and commutator. Could the OP remove the brushes to show their length and the rotor's commutator condition?
itís almost never the brushes. people getting over 200,000 miles and 20 years later on original pumps.
true it is a weak link, but not the weakest link.

running them low-empty overheating and poor fuel quality the biggest killers. followed by overworking them from crud-filled choked filters.
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Old 01-14-2020, 07:55 AM   #13
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For science purposes i'll take the brushes out as well
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Old 01-14-2020, 10:18 AM   #14
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All fuel electric pumps are completely submerged. It cools the rotor and prevents sparks from exploding the tank. Fuel lubricates the brushes plenty.

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Old 01-14-2020, 10:44 AM   #15
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Very cool. Thanks for sharing.

I have the feeling that a fuel pump is in my near future, so this is especially useful.

What does the fuel level sensor arrangement look like? I have never had one out on an E46.

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Old 01-15-2020, 07:58 PM   #16
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If the pump is lubricated by gasoline, which is a pretty poor lubricant, I wonder if the life of the pump could be extended appreciably by adding a small amount of two-stroke oil to the fuel. I think a small amount would be tolerated by the cats.


Refineries use additives in the gas to assist in lubrication. Thatís why cheap gas can kill a pump


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Old 01-15-2020, 10:13 PM   #17
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Refineries use additives in the gas to assist in lubrication. Thatís why cheap gas can kill a pump

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Exactly. Which is why it's *possible* that a small amount of additional lubricant might help pump life. 2 stroke oil is designed to stay mixed with gasoline, and it is designed to burn cleanly without ash or carbon deposits. I doubt it would be harmful to anything (at reasonable ratios, say 100:1 or less). Whether it would be helpful is unknown.
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Old 01-15-2020, 10:15 PM   #18
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Originally Posted by Alex323Ci View Post
itís almost never the brushes. people getting over 200,000 miles and 20 years later on original pumps.
true it is a weak link, but not the weakest link.

running them low-empty overheating and poor fuel quality the biggest killers. followed by overworking them from crud-filled choked filters.
What parts fail due to those causes?
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