Dual Tanks

[Will84K10]

I have read quite a few threads on dual tanks but haven't seemed to find an answer for my issue. When I bought the truck 2 years ago, I was told that only the driver side tank worked. And now after getting around to it I decided to buy a replacement dash switch (old one was falling apart) and begin troubleshooting. So I installed it and with the key turned I depressed the button to the passenger tank and heard a click like it was swapping and then my fuel gauge needle jumped to about the 3 o'clock position. I'm not sure if there was fuel in that tank or not and wasn't gunna try and start the truck with such old gas in the tank if so. So I guess after all the rambling, my question is... would the needle being in the 3 o'clock position when switched indicate an electrical issue or what? Thanks.

[SkinnyG]

3 o'clock usually means the sender is not connected at all.

It could be the switching valve is pooched, and not connecting the passenger sender to the gauge, or it may not even be doing anything.

The switching valve isn't that expensive to replace brand new.

[Will84K10]

alright sounds good. I'll try replacing it then. Thanks

[edgarollins]

I agree with Skinny.  If you were told the left tank was the only one working, it is likely the switching valve underneath has failed.  Especially if you are seeing the needle at 3 o'clock.  Hope you have a Merry Christmas and a Happy New Year.

[MichaelM]

Any links to replacing this switching valve?  I have an 83 k10 with dual tanks.  Both tanks transfer fuel, but both also read 3 o'clock on the gauge.  Any help?