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Old 01-21-2020, 02:15 PM   #1
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Dual diesel fuel tanks looking for info.

I purchased a CC aft axle 35 gallon diesel tank with pump and lines coming out of the tank.
I'm wanting to keep the cut mid-ship tank and install this new (to me) tank in my 2002 EB 7.3
I had a 1992 F-150 it had two factory fuel tanks with a selector switch on the dash. Having this switch I can see the fuel levels in either tank with a flip of the switch.
I'm wanting to install this type of set up in the van having a total capacity of around 65 gallons.
I know the easiest method is to install a transfer pump but I want the switched system. I presume the diesel F-250's of the same 1992 era probably have the diesel switch I'm looking for.

I'm sure someone has done this. How would the fuel lines and returns be plumbed? Is there a switched port that all the lines go into? I can understand switching the two supply lines but how do you keep the return lines going only to the corresponding fuel tank?
How do I extend the fuel lines?

In the pic is a 3rd line coming out not sure what this is. Hopefully, is it an accessory fuel source line for my future diesel heater.

I won't be able to install this for another month at least but hoping to try and round up as many of the parts in the mean time.
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CC tank pic.jpg  
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Old 01-21-2020, 02:45 PM   #2
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Diesel tanks don't have a pump inside, just a siphon tube (the larger tube in your picture). The other line is the return line (grey line in your picture). The third line is an aux fuel port connection (the shorter line with the wire wrapped around it in this picture).



The older trucks with dual tanks had a switching solenoid/valve/module with multiple input and output connections. I doubt it is any more complicated than hooking up both tanks to that valve.
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Old 01-21-2020, 03:34 PM   #3
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Michael, as always thank you for your in site. I presume the selector valve would go between the front tank and the frame mounted fuel pump.
How does one make custom fuel lines?
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Old 01-21-2020, 04:00 PM   #4
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Your current setup includes soft lines where the hard lines transition from the engine-bay to the frame-rail. This would be the easiest location for the selector valve. Then you can use the a second set of factory lines all the way from the rear tank to the selector valve.

You can buy the valves aftermarket but you'll need an OEM switch. And either scavenge a harness or DIY. BTW - Ford offered dual tanks all the way through 2016 on the cab-chassis trucks, so you should be able to find parts used.
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Old 01-21-2020, 04:23 PM   #5
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Carringb, you never cease to amaze me with the depth of your knowledge. Thank you.
How does one make Ford style soft lines to a custom length?
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Old 01-21-2020, 04:45 PM   #6
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I've successfully used "push to connect" fittings at the tank sending unit connections with Aeroquip fuel line and AN pushlock or "socketless" fittings. Not sure what the fuel pump or tank switch fittings look like. Dorman makes factory fuel line kits that can be made to length as well.
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