I believe your previous sender was working just fine once you had it dissassembled. Don't assume the 'middle' of the sender is half a tank, the odd shape of the tank means you won't have a 1:1 ratio of height of sender to fuel remaining in the tank. I believe your sender was just getting stuck on the rod due to dirt or whatnot. Great video thanks for sharing.
These are interesting units. The original is VDO and after removing the one on my survivor 68 911 S., it was clear it had stuck on the shaft after 25 years of improper storage. So the unit appears to be the same as yours. I'm not sure if the three wire system is based on variable resistance, or variable inductance with the gauge sending out an AC signal. I'm not going to hook up my oscilloscope to find out... at least , not yet. The comment about the sending unit providing a nonlinear output that matches the tank volume (made by another poster) could be quite correct. In addition, I always check the operation of the new part before going to the trouble to reinstall. Stuff today is just not made like the old German parts... sadly. Thank you for the video. We need more people working on their own cars.
Well done. Had the same issue on my (new to me) '85 911. Just replaced my sender unit - problem solved. My only suggestion would be - when it's an option, always replace the gasket. Thanks again!
GREAT VIDEO! Thanks for this video. The work looked well filmed and clear. I think you’ll be the first stop next time I have a problem on my 1988 911 Supersport Targa (UK).
Nice video! Safe to assume the new sending unit resolved your inaccurate fuel level issue, or was there a problem with the gauge? As you noticed, URO sending unit 901 741 801 00 is an excellent reproduction of the original. (You might want to add the part number to your title and description, to help the video appear in search results.)
