Wiring dual fuel tanks to one gauge?
 

I'm having some troubles with my rear fuel tank (specifically the switch went bad), I bought a replacement but it's not working correctly.

So.... I'm planning to start from scratch and rewire the rear tank to the gauge. The in-cab tank works fine and reads on the gauge. But I'm unsure how to wire in a second tank to read on the same factory gauge.

Has anybody done this before? Can you help me out with a basic run down of the wiring diagram that you used? What type of toggle (on-on, on off?)

Any help would be greatly appreciated

fuel tank
 

sportfuryjoe just wanted to know if you got your tank wired in i am doing the same and also could use some help please let me know thanks john oh and your crew cab is sweet

Go here for the FACTORY wiring diagrams 1973-1979 Ford Truck Wiring Diagrams & Schematics - FORDification.net this should give you an idea of how it was wired from the factory.

There are two different: switches, fuel tank selector valves and wiring diagrams.

1973/74's have a manually operated fuel tank selector valve on the floor adjacent to the drivers side of the seat. All the switch does is change the dash fuel gauge from one tank to the other.

1975/79's have an electric fuel tank selector valve & solenoid assy (mounts on the frame rail). The switch changes the tanks and the fuel gauges.

1975/79: D5TZ-9A050-A .. Fuel Tank Switch / Available from Ford / MSRP: $35.29 / FTE sponsor tousleyfordparts.com price: $21.35.

1975/79:D5TZ-9189-B .. Fuel Tank Selector Valve & Solenoid Assy / Obsolete / No Ford Dealer or obsolete parts vendor has any.

Subscribed for future reference.

switch??
 

i have a 73 SCS with dual tanks and i think the switch is bad. it is located next tto the climate control (opposite the fan switch) its part number is D3TB-9A050-AA. does anyone know where i can get one or what part number replaces this one?

The p/n is D3TZ-9A050-A
Switch assy., fuel tank selector
D3TB-9A050-AA, 3 terminal
Unfortunately I couldn't locate any dealers or obsolete suppliers that had any.

does anyone know if it will cross over to another number by chance?

Try Ford Parts - Genuine OEM Ford Auto Parts at FordPartsGiant . I've never heard of them before but I was doing a random search for the switch and came across this site.
According to the site they have the D3TZ-9A050-A switch, cost is $37.01

Before you replace it you may want to mess with it, heres what happened to me. Mine would not switch to the rear tank either, test light on the valve below the cab showed no juice. In the process of replacing the vacuum switch for the heat control behind the dash I had to unplug the selector switch for the tanks. After I plugged it back in I switched it and heard a click below the cab and the needle on the gauge moved, put the test light back on it and sure enough it was getting power now. I have been using the rear tank ever since.

thanks
 

I did take it out and mess with it some. Once I hooked it back up it started working. Now all I have to do is find a sendng unit for the rear tank. It has a 25 gallon plastic tank. I can not find one anywhere but I was looking and wonder if a sending unit from a late sevetys bronco might be the same. Anyone have any ideas?