someone once asked me toshow my dual tank setup and i never got around to it because i'm a jerk. Now is as good a time as any.
here is the tank and the fuel send. obviously a lot of options will work for a tank, but remember that modifying a DOT approve fuel tank is illegal. I am not saying don't do it. I just think you should be aware. The really important part about a tank is that you have some method to preheat the fuel, whether it be WMO, WVO, or some mixture of fuels. This prevents gelling, improves LP and IP life and is generally better for the engine
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how this is all handled on my kit is by using a PEX fuel line inside heater hose filled with engine coolant. As the line on the left enters the tank a compression fitting an an aluminum block seperates the fuel line and coolant. The fuel line becomes the pick-up and the coolant travels though a length of coiled copper tube to heat the fuel before returning to heater hose to go back to the engine
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The coolant jacketed fuel line comes up into the engine compartment. Again an aluminum block and compression fitting seperate the fuel line and coolant. The fuel then goes through a filter that is wrapped in coolant filled copper tube. the fuel then goes to the fuel feed selector solenoid. The diesel fuels i rerouted to go through the diesel filter then to the feed selector solenoid. From the selector solenoid both fuels go to the LP and up to the IP
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the return line comes from the back of the return fuel rail to the return solenoid where it is either routed back to the diesel fuel tank, or back to the WVO/WMO fuel line just before the filter.
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The solenoids are controlled by a three postion switch in the cabin. Diesel, Alt fuel, and purge. (purge selects diesel from the feed select solenoid, but returns to the Alt Fuel line in order to purge the fuel out of the lines)
So that's my kit. There are a lot of different ways to accomplish a dual tank system. You can make your own fittings to create a hose in hose fuel line. i can send direction on that to anyone interested in it.
Hope this was valuable ot someone. Thank the rain for keeping me inside on a saturday morning.