Recently fuel tank contamination apparently did a number on the fuel pump and filter on my 1994 K75. After cleaning the tank, I found, as expected, the fuel injectors were apparently blocked and not working.
A search for help from local repair shops yielded nothing. Sending them off to a BMW shop would be about $50 a pop - plus postage.I elected to try to clean them myself.
I wish I could tell you I came up with this, but I did not. Here is a link to the video where I got the idea. He is working on injectors from a modern BMW R-bike. His cleaner appears at about 7:30 into the video.
And to the right is my interpretation of the same cleaner.
The switch is a micro switch from the junk box. I did not have the proper connector so I had to adapt some female connectors from a plug - also from the junk box. The syringe I found for $1 in the veterinary department of our local feed store (click on the images to make them larger). I did replace all the O-rings (FEL-PRO ES 70599 - at the local auto parts store) - about $8 for two packages of 4.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7xUgIHblvTK74lQ7G4xdXf60FEJu2aatSpbFEzWbgMOltV73_-EllZXiQShK1vVaiMZTFUYFQ9i638xE-jE3Y0ramkZhHXM-1Wc8ZiNa9jpVEjjga5w5lND6seGWyLRu6uAewnkAI7iLg/w174-h320/Injector_cleaner4.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzNmdJKGJxr5i3StwRrlAYy9fx5_g3W-XhOFvhWDw2kiNIP_lAH-UL-ldS0MUolCyAJMrTFsuRAH4zU-E3h5zqs0rdnTmhsjsgl8-2A4gQjyx3ap5LMBmhw8VwHJzDzbCKnD4uuonwsu0x/w158-h173/Injector_cleaner3.jpg)
The cleaner proved very successful.
I used ethanol (denatured alcohol) first, then B-12 Chemtool. I think the ethanol did the most good for the contamination I had.
Re-fitted the injectors to the rail (which I also cleaned), buttoned everything up and the K75 started up after about 3 seconds of cranking.
Very pleased. My sincere thanks to Doug Rost.
cln