Whats the critera for a rebuildable 3 port pump?, Insidea Bosch 3-port Bosch FI Fuel Pump D580463009 Options

[Superhawk996]

I have a 3 port Bosch FI pump D580463009 that came to me along with some other FI parts I purchased long ago. It had clearly been molested previously.

I decided to power it up. Yup, motor runs.

I decided to see if it would actually pump some alcohol since I didn't want to risk gasoline. Good thing . . . it leaks like a sieve.

Having nothing to lose, I decided to disassemble it. There was massive leakage out of the motor housing and the large O-ring that goes between the pump rotor base and the DC electric motor housing was clearly torn and rolled when I disassembed it and this is where the bulk of the leakage was coming from.

I'm wondering if someone can advise on what the criteria is for a core / rebuildable part since these clearly aren't cheap to rebuild nor are they easy to come by.

@914sixer
@dr914@autoatlanta.com

Here are some pictures for those curious about the intertnals of a 3 port rotor pump.

Rotor inlet & outlet housing:


Pump rotor and vanes:




The motor rotor, windings, and brushes:



And finally the inside of the motor housing / stator permanent magnets

[Bmw635]

I am disassembling this same 3 port pump from my recently acquired 914 and found gas full in the body of the pump motor. I see the Oring in between the impeller housing but how could gas leaked into the motor housing?

Pump is running on bench now so if I know why gas was in the motor body, could I install it back to fire up the engine?

[Superhawk996]

I am disassembling this same 3 port pump from my recently acquired 914 and found gas full in the body of the pump motor. I see the Oring in between the impeller housing but how could gas leaked into the motor housing?

Pump is running on bench now so if I know why gas was in the motor body, Icould install it back to fire up the engine?

I believe the pump is liquid cooled by the pumped liquid.

Look at the picture of my pump body without the rotor and vanes in place. There is a hole there that leads directly from that pump side containg the pumped liquid directly into the pump motor body. The hole is completly open connecting the rotor vane pump cavity to the motor rotor/stator assembly.

It is esentially a DC motor running inside a can full of the pumped liquid.

The reason the inside of my motor "can" is so dirty is that is all the residual particulate debris that is small enough to go though the fuel filter that has been carried into the pump housing and the motor housing by the gasoline.

Your DC motor armature appears a bit different than mine. Yours appears to have some winding covers that likely serve to help cut down on the viscious drag of the armature as it rotates though the fluid.

I find this pump to be interesting but still haven't had much chance to get over to the bird site to see if I can find more info on it's design.