My fuel gauge started intermittently reading empty last year, and now is reading empty most of the time when the tank is full. When it is about 1/4 full, the fuel gauge works most of the time.
I'm guessing the fuel sender(s) is messed up. From FCPeuro site my volvo has a left fuel sender and a right fuel sender. When I pulled up my backseat seat bottom, I can only see a round
hatch on the left (driver) side, I assume that's where the left sender is. But I can't find where the right sender is. It isn't under the right rear seat. So where is it?

Thanks,

 

Both senders are on top of the tank - the right side is built into the fuel pump assembly - this may not be your emission code but the senders are always in these positions.

 

Thank you very much! WIth your diagram I was able to find the right side fuel sender (at least the metal cover for it). It is located directly underneath
the backseat seatback. Now the next question is how to remove the seatback so that I can get to the fuel sender.