Short Sttyle Fuel Pump Rebuild

[BaronYoungman]

So just a follow up on armatures.  I have a photo of two overheated armatures  on outsides with a good (but not aesthetically pleasing) rebuilt  armature in the center.  You can tell the others have been overheated by the glue coming out (see red highlights) also the magnets have come out of alignment due to the force of the electromagnet and the soft glue melting (see yellow dots).  Just a FYI.  But the center armature is good just not pleasing to the eye but works 100%.
P.S. Dan I will find that pump I have it somewhere, and Peter you are exactly correct the tall pumps are a wet/dry system that I am sorry to say I have given up trying to rebuild those tall pumps.  As my grandfather always said , just do one thing, but do it well.

[Benz Dr.]

Those are very interesting pictures. I've had pumps apart before but never really studied them that much and now I know a little bit more about what to look for.

[mtoomey]

For what it's worth and if it's helpful to the group, Bob has now done two Mercedes pumps for me and a friend and both are terrific - highly recommend him and the very fair price charged for the service..

[UJJ]

Your knowledge of the fuel pumps is just amazing Bob.
Thanks for sharing.

[Benz Dr.]

Not to take even one spec of credit away from Bob, but anyone who takes a concentrated and keen interest in any part on our car, can, over time, become very good at working on that particular part. To become an expert on every single part on our cars is a very tall order indeed.

Even little old me farms stuff out when and where I need to. 

[Joe]

A couple more questions on the short pump....
How does one put new brushes in the pump without removing the fiberboard?
With the fiberboard out, is it possible to re-secure any brush holder that has come detached?
Joe

[Desertpagoda]

curious, if all else is equal, how much difference doe 1 or 2 broken vanes make in the pumps output/pressure/delivery?

[BaronYoungman]

I am currently out picking up a parts car when I get back on Sunday night I will post some pictures that maybe will answer some questions. It would be too hard for me to describe without some photographs to refer to
Bob

[BaronYoungman]

So to remove the brushes you have to remove them out through the center and sometimes this is not possible because the brush itself has the copper lines through the top of the brush what you need to do in this case is take a exacto knife or even a very small screwdriver break out the back of the old brush while it is still in the holder and pump so you can get the copper lines to lay flat and remove through the center the first picture is a brush with the line exiting on the top which would make it impossible  to just  pull past  the holder without  causing the holder  to become unattached from the fiberboard the second is how I cut a Groove this would be done while the brush is still in the pump  and in the holder  you would need to disattach the spring to be able to push the  brush far enough back to cut this groove the third again this is still while the brush is in the holder and in the pump I just have it out of the pump to illustrate is how the copper lines will now lay flat and the last one is removing it through the center. Just to try to make this easy I will answer the other questions in separate post.Bob

[BaronYoungman]

Joe to answer your question because those brush holders I have just the 2 bent leg bottoms holding them to the fiberboard I think your best bet is to actually screw with a very small screw to the fiberboard but not deep enough to touch the casing where are the legs used to go. If the fiberboard is already out you could use a longer screw and then Dremel it down so when you reattach the fiberboard to the casing it does not touch the aluminum.

Desert Pagoda to answer your question I have seen them with one missing tooth and a rebuilt Armature turn in about an 89% of Mercedes spec so I believe you would be okay for idling or around the town driving but the longer and more spirited you would drive it the more of a deficit you would have eventually I believe you would have fuel starvation. I am always learning I know I used to say that it was okay to run with one missing tooth but now that both myself and babak are making replacement impellers it is well worth to just replace it.

[PeterPortugal]

Bob,
Where can we buy your impellers? I see the other ones on ebay.
Regards
Peter

[Joe]

Thanks, Bob, very clever! I was stumped on how to remove the old brushes.
Joe

[Joe]

Hi, Keith,
Many of the pumps I have taken apart show evidence that the impeller was balanced during manufacture. There are often some (I've seen 1 to 3) shallow holes drilled in the impeller which clearly were done so the impeller would spin smoothly by having its mass uniformly distributed about the center. (Like balancing a wheel on your car.) I would not use one with a broken vane, but I would think it reasonable to break off the opposite vane to keep the balance. That will impact the flow rate through the pump; I can't say whether it would be enough to starve the system of fuel. If you try this, let us know the result.
Joe

[BaronYoungman]

Peter just PM me. I don't like selling my impellers directly to the public. The reason being is if your impeller is that corroded there are probably other issues with your pump. But Peter I know you know what you're doing so just send me a private message and I have either nice used original ones or stainless steel available. Thanks Bob

[PeterPortugal]

Thanks Bob,

I will do that. I have three, the first is missing teeth. the second is complete but so worn you could cut yourself on it and the third has teeth in good condition but serious wear on the "D" shape hole for the shaft. It's stainless steel for me....the next best thing to titamium !!

I appreciate your continued support as the "go to" resource for fuel pump issues !

Regards

Peter

[mdsalemi]

...I don't like selling my impellers directly to the public. The reason being is if your impeller is that corroded there are probably other issues with your pump.

...and THAT my friends, is the difference between an amateur and professional...

[UJJ]

Agree with Michael!
We do have incredible members here, and Bob certainly is one of them! Thank you Bob.
Urban

[PeterPortugal]

Bob,

Just a reminder about the stainless impellers. I sent a PM a few weeks back.

Thanks

Peter

[BaronYoungman]

Invoice sent via PayPal.
Bob

[PeterPortugal]

Hi Bob, I haven't got an invoice. See PM's

Peter