rAudiA8

when my gas goes below half tank my fuel guage starts to malfunction... as i'm approaching a stop the needle literally drops to empty! As i accelerate sometimes it bumps right back up to where it was before and sometimes it does not. Has this happened to any other A8 owners out there? Do you think it's a fuel sending unit malfunction or a problem with the regulating pumps in the tanks?

icsamerica

Test the guages with a VAG-COM, there is a specific test for the guages, it makes them sweep slowly... but to me it sounds like a faulty fuel tank sender.

mart_o_rama

I had the same problems, *sometimes* would the needle suddently drop from 1/4 to empty. I opended up the two fuel sender unit, cleaned the connections, and never had the problem again since. The connector appeared to be a bit smudged, so I think that was it.

Martin

rAudiA8

changing a fuse... are there any DIY's regarding this issue that anyone can think of? I've searched and i'm not having any luck... if this is out of my reach i'll have to bring it in... thanks for the help

mart_o_rama

there is some procedure to get them out of the fuel tank from the trunk access.

See these pics when I removed mine:

<img src="http://pictureposter.audiworld.com/68260/fuel_sender_unit_1.jpg">
<img src="http://pictureposter.audiworld.com/68260/fuel_sender_unit_2.jpg">
<img src="http://pictureposter.audiworld.com/68260/fuel_sender_unit_3.jpg">

There is only one connection in each sender unit. Considering that the resistance value of the unit itself (a large flimsy spring with a flotting weight at the end) is in the low Ohm values, then a bad connection can easily make the read value vary significantly.

Good luck,

Martin

rAudiA8

thanks for your info, i'll see what i can do...