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Old 11-02-2012, 12:37 PM   #368
Eliott's-BMW
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Join Date: Oct 2008
Location: TX-DFW
Posts: 1,099
My Ride: E46 3-Pedal Mafia
Quote:
Originally Posted by love2drive330CI View Post
Ok...going outside the box here...work with me as my brain is always looking for a way...sometimes it goes astray.

If the fuel pump is a mechanical failure, inside of it somewhere is the fault for failure. Perhaps if there are brushes in it like the alternator has the voltage regulator; anyone ever look into that or consider the root cause of the pump failure by dissecting it? I am thinking something wore out/wire/brushes etc. but the casing is probably still sound.

I know we can say it is easier to replace it with a new one at a cost of approx $120.00 but if the part inside failing is replaceable and say $5.00 that would help the cause. I only say this from when I dissected the buttons to our windows and noticed that it was a tear in the rubber like boot that caused the window failure; which could be fixed by repairing the rubber break or making a little molded piece out of silicone.
(or how Raj figured out the o-rings to the vanos)

I will open up my failing pump once I get my replacement but for the record my expertise is not really down the mechanical alley. I enjoy it for the tinkering and learning and sharing of information.

So has anyone opened up a failing/failed pump to identify the "root" problem?
I have, the problem is the brushes are worn inside the dc motor, also the dc motor is pressure sealed and once you force it open it's hard to re-seal it the way it was (if not sealed properly the flow rate will be compromised) .

It would be far better to just find a new dc motor with the same specs as the old one and just replace that part.

If anyone knows where to find just the new dc motor let me know.
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Last edited by Eliott's-BMW; 11-02-2012 at 01:26 PM.
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