Adding a fuel tank

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On my Mack, the driver's side is where it pulls from and returns to, and there's just a cross-over line from that tank over to the passenger side. Gravity keeps the two sides level. So, if you've got 1 tank on the passenger side and want to add 1 to the driver's side, just mount it up. Once the tanks are in place, remove the drain bung on the front (or rear...whichever works best to keep the crossover line away from any spinning drive shafts and NOT on the under-side of the tank to get ripped off if you high-center) side of the tanks near the bottom and install a shut-off valve. 90 degree bend on each to get them facing each other, and run a fuel line between the valves, securing it so that it isn't dangling to get ripped off by road debris or rubbing on chassis parts. My tanks are directly under the cab, so the front side of the tank puts my crossover under the transmission and out of harms way. With your tanks back farther on the frame, it might be more difficult, since you'll want to keep the line low and level...any fuel below the highest point of the crossover will never make the trip into your other tank. If that's going to be a problem, you're installation will get more complicated.

 

Might go from the back of the one tank to the front of the other, depending upon what's in that area to tangle with the crossover line...just be careful stopping on an incline when fuel is low!. I've only got 1 fuel gauge, no switch on my truck as well...like I said, it's just gravity moving the fuel from my "extra" tank through the crossover line into my main tank. That line needs to stay as low as possible, because any fuel below it's highest point won't be moving across into the main tank without some help.

I suppose what you could do is set the aux tank up like a transfer tank, adding a switch in the cab to a pump that moves the fuel over into your main tank. When the main tank gets low, throw the switch and fill'er up on the fly...then when you get low again, stop for fuel and top 'em both off. That would probably be the easiest way if a simple crossover won't work. The trick is to not let the aux tank go dry and burn up the pump, but if both tanks are roughly the same size and you move the fuel @ 1/4 tank, you ought to always have at least 1/4 tank in that aux tank.

 

This thread is exactly what I needed...lol

I tryna switch out my teeny weeny 50gal tank on my driver side.

 

The problem you might run into during cold snaps or if you run up north is that the aux tank isn't getting any return fuel to help keep it warm...so if it isn't treated, it'll gel up a lot quicker than the main tank...and if that happens, you're down to one tank until it thaws out again. I haven't had that happen to me, but I'm in the lower midwest...doesn't get too terribly cold around here, and when it does I treat my fuel.

 

Well then you should be fine.