Fuel tanks wont switch. Only burns from rear tank and transfers fuel to front.

inside the fuel tank

If fuel injected. the tank selector valve switches both the suction line from the tank and the return line back to the tank. It sounds like you have a stuck or bad tank selector valve if the return is not being ported back to the rear tank.

There is no switch. What you have is a "transfer pump" that moves fuel from the rear tank to the front tank as required, so that you get a smooth declining indication of fuel left on the gauge in the dash.

If the transfer pump goes bad, any fuel in the rear tank will not be pumped to the front tank so you'll only be running on the front tank.

The fuel level indicator is on the front tank, so the gauge will still accurately register the amount of fuel in the front tank.

no both taks have there own pump inside the tank, when you run a tank empy the fuel pump sucks up some of that nasty sentiments in the bottom of the tank, this will sometimes burn out a pump, there is however only one fuel filter located on the drivers side along the fram near the drivers door, however if tank 1 still works it is not the filter causing the problem

Fuel levels are equaled in the tanks via a frame mounted transfer pump that transfers fuel from the rear tank to the front tank where the main pump is. Your transfer pump needs replaced, and should run about 60 bucks. Should find the pump mounted to the frame between tanks.

If there is not a mechanical fuel pump on the side of the block it will have a pump in that tank on some fords you can get to the tank and check for power if it has a pump in the tank otherwise you have a vacuum leak in the line or the fuel tank filter is plugged. also and this is what I would check first is test the switch for it switching power from one side to the other and see if you here the switching valve shift over. I had to replace a few of them over the years. Normally it's the valve itself it gets junk in it and does not allow the valve to switch.

It Maybe The Fuel Tank Selector Valve On The Frame Rail That Switch From From Tank To The Rear

85 ford 350 econoline van with 460 engine and duel tanks, lost prime on both tanks, cannot get gas up to inlet on carb, it happen after having shot work on vaccum lines, i can't hear the pumps in the tanks making a buzzing noise, i hear a click when i switch from front tank to the rear tank , somewhere under the hood, on the driver side front fender, what is the next step.

I have to say i'm only guessing, but it sounds like the valve that switches the flow of gas from one tank to the other must be sticking part way open, or bypassing or something, and anything your engine doesn't require, is being returned to the front tank, instead of the rear.

The switch that you use to change tanks is probably faulty - the switch supplies power for the sending unit in the tank, and to the transfer switch for the gas lines - use a meter to check it