tii original fuel pump: repair?

[JohnS]

You can create a simple little pigtail using a couple of spade connectors, some wire and a couple of eye connectors to adapt the stock tii fuel pump wire harness to the new style pump without hacking the original wires and connector.  That way it can easily be undone.

 

Wrap it in a little friction tape and nobody will know.  You might notice that the newer style E28 fuel pumps are quieter though 🙂

[Tomfish]

On 11/17/2022 at 8:59 PM, Tomfish said:

Just something I want to share with the community, I took my pump apart tonight. Not the hardest thing to do, just need a little patience. Mine had the same issue as the OP, leaking from the electrical connector. I'll update you on the O-ring sizes needed to rebuild it.

 

As promised, the sizes of the o-ring. I used Viton o-rings because they are resistant to biofuel etc.

 

- 33x2 Viton 80 Shore A (2x)

- 8.5x2 Viton 80 Shore A (1x)

- 51x2.5 Viton 80 Shore A (1x)

 

Things didn't go as planned (as usual). The board where the brushes were mounted on failed (well, actually the pegs on the brushes failed), so I had to make myself a new PCB where the brushes could be soldered on. Now the pump purrs again nicely :-).

 

 

[jimk]

A great search for replacement brushes is due.  Those may be the cause of many pump motors that quit working.   One of the photos shows where when the braided strap is not that far away from the end of the holder slot.

[Tomfish]

For those who need the drawing of the PCB, please feel free to use them.

bosch_tii_fuel_pump.dwg bosch_tii_fuel_pump.pdf

[chargin]

On 11/17/2022 at 8:34 PM, Gordon said:

E28 fuel pump conversion. This conversion is well documented, no regrets

 

I've been using this one for 4 years happily, it did need a section of radiator hose as a shim for the Tii bracket