draw from both tanks - Ford Powerstroke Diesel Forum
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post #1 of 39 Old 10-13-2013, 12:35 PM Thread Starter
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draw from both tanks

Has anyone heard of or know if you can hook the two tanks on our obs to where it will draw from both at the same time so you dont have to constantly switch em back and forth. was thinking about maybe doing something like this after i do an electric fuel conversion. thanks

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post #2 of 39 Old 10-13-2013, 12:52 PM
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It looks to me like you have two choices, either an electric pump from one to the other and just draw from the "pumped into tank" all the time or sump both tanks and have a transfer line between the two.

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post #3 of 39 Old 10-13-2013, 02:12 PM
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How would you determine to which tank the unused fuel returns, without overfilling one of them?

You also lose an important functionality of dual tanks. With dual tanks, you can run one tank down, fill it, then switch to the other tank (the one you _didn't_ just fill). Then repeat for the other tank. IOW, never fill both tanks at the same station/pump at the same time. That way, if you get a bad batch of fuel, you switch to the other tank and can at least drive the truck until you get the bad fuel issue resolved. Also, if either tank rusts and leaks, you have the other to drive on. With an automatic transfer system you lose that. Compared to flipping a switch once every 300 or so miles,.....
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post #4 of 39 Old 10-13-2013, 02:51 PM
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Yeah, there are problems to be worked out, I was just throwing out a couple of options to prevent the OP from flipping a switch.

On my old '86, it defaulted to the front tank in the event of a solenoid failure, which never happened, so I would fill both tanks and run off of the rear one first.

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post #5 of 39 Old 10-13-2013, 03:02 PM
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You also have to watch if one tank runs out, the pump will draw from the empty tank, to successfully do this you will have to have to install a balance tube between the tanks.
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post #6 of 39 Old 10-13-2013, 05:32 PM
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How does a balance tube work

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post #7 of 39 Old 10-13-2013, 06:13 PM
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or sump both tanks and have a transfer line between the two.

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to successfully do this you will have to have to install a balance tube between the tanks.






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How does a balance tube work
Basically a fuel line ran between the two tanks, from the bottom of them.

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post #8 of 39 Old 10-13-2013, 06:16 PM
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Balance tube is just what it is. It's a tube between the two tanks. Liquid will seek its own level problem is like on my truck front tank is 15 gals and rear is 10 gals so instead of being able to have 25 gals you can only have 20 gals otherwise the rear tank overfills. You would have to put a tee in the balance tube inorder to draw from both tanks equally.


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post #9 of 39 Old 10-13-2013, 06:20 PM
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I think it would be easier to modify tanks with a second float with end switches to swap tanks at a predetermined level automatically.


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post #10 of 39 Old 10-13-2013, 06:22 PM
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Or just run it as Ford designed it.

Anyone else notice that the OP hasn't been back?

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