dual fuel tank problem 87 chevy

[01ram4x4]

i have an 87 k10 with dual fuel tanks i normally only fill one tank because passenger side tank wont work ive noticed ive been using alot of fuel lately i was wondering does this system pump fuel from one tank to the other if the other is empty i havent found any gas leaks but i pulled filler neck off of other tank and ran some wire down in it and noticed it did have fuel in it and when i flip tank switch on truck it reads a half a tank but truck wont run off that tank i really dont know much about this system or how it works any help would be great

 

[rodney eppes]

Not really sure, but having a selector switch, I would say it does not equalize, the tanks. You probably have a problem with the switch, & that may or may not affect the gauge.
Unless you use A gauge, all the time, then really can't tell if it reads correctly.