Fuel Gauge Tank Selector switch and valve

[danzey]

1984 K10 - two new tanks. Two new fuel sending units. One is an ac delco the other is from LMC. Ground from battery to frame and then to sending unit is good.

Fuel gauge is stuck at 9:00.

Fuel selector valve moves between the two tanks but doesn’t run correct on the passenger side as it will only idle and drive around slow - any throttle demand and it dies. Assuming I should replace selector switch first and then possibly the selector valve?

Can the switch and or valve cause my fuel gauge issue? The pink/black stripe wire is not carrying any resistance up to the gauge.

 

[Jgonick]

Fuel gauge at 9 all the time or only with passenger tank?

The pink/black stripe wire is not carrying any resistance up to the gauge.

Usually PNK/BLK goes to valve (from passenger tank sender) and from valve the PNK goes to gauge.

edited to include wiring diagram-just in case.