Only my rear tank works. When I switch to the front tank it kills the truck? Is it the fuel system? Actuator? Switch? What would it be?

 

it might be the fuel pump, try switching to the front tank, while your truck is sitting in your driveway not running, and turn the key to on, if you dont hear a hum, it is more than likely the fuel pump, you should hear a hum when you do the same thing except switched to the back tank.

 

Very common problem with your year.

 

Have the same problem with mine, you'll be able to hear the hum when it's on the back tank and it should sound the same when you switch back