SOURCE: can not switch between dual tanks on 84 chevy
The switch on the dash could be bad.or the actual select valve under the vehicle.test for votage at the select valve to determine witch is bad.
SOURCE: 1982 chevy truck with dual gas tanks with guage or tank problems
all you need to do is listen to hear the tank switching valve is working. It will make a soft noise under the rear cab section with the key on with the engine off. zif you do hear it sounding the switch your tank unit for that one tank you try to switch to is a fault. Sorry no illustrated diagrams are on hand, just knowledge
SOURCE: 2002 Chevy Silverado 3500 Fuel gauge reads 1/2
If this was not a problem before the pump replacement then the sender in the tank may of faied or is contaminated with sulfer which is corrosive to the silver electrical contacts.
Do a search on sulfur corrosion and fuel sender units. Gm has big problem with this. Its possable the stress from removing the old and installing the new pump created an issue with contacts. If this is the case you will now need a sender unit.
SOURCE: i have a 1983 chevy dually with dual tanks. the
i believe this vehichle reads exteme full if the tank sender wire is disconnected,or if the wire for the gas gauge is broken,or there is corossion in the harness connectors.
SOURCE: 2007 Chev. 3500 flatbed deisel trucks w/Dual Tanks
Unless they have a seperate switches for tanks and gauges they equallize to give you a overall reading.
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