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The solenoid is mounted on the back side of the tank. From under the truck you can remove the valve wiring connector, remove the valve from the tank and remove the lines from the valve and canister. If there is no hose on the new valve, then use 5/8 heater hose to run the filter for the valve beside the transmission.
No the tank does not have to be dropped, but this being a utility does change this a bit, but not much.