Fuel tank switch

[loganstecker]

I have a 1984 c30 it has the dual tanks both were working last year when i put it away but when i pulled it out this year one tank was empty the other was half full so i drove on the half tank to fill up filled up the other tank but when i ran the first tank down to an 8th tank i hit the tank switch and the gauge didnt move i can see the needle still move for the first tank when i drive around thinking its the switch but wanted to see what else it could be thanks

 

[Broken85]

It’s the switch, or the switch valve. Have someone throw the switch a couple times while you are under there and see if there is any life going to it.

The switch is like $10 from LMC. Put it on a multimeter and see if it’s actually bad first. My bet is switch valve or another wiring problem. Everything goes bad, but I haven’t seen a bad switch yet.

 

[Jgonick]

attachment- wire diagram might help run down problem.

 

[Ricko1966]

I have a 1984 c30 it has the dual tanks both were working last year when i put it away but when i pulled it out this year one tank was empty the other was half full so i drove on the half tank to fill up filled up the other tank but when i ran the first tank down to an 8th tank i hit the tank switch and the gauge didnt move i can see the needle still move for the first tank when i drive around thinking its the switch but wanted to see what else it could be thanks

Honestly first thing I'd do is pull the switch, check continuity, flip the switch the other direction see if continuity switches.