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casper5280 11-27-2010 02:12 PM

Adding a spare diesel tank.
I want to add a spare diesel tank to my 2008 Dodge Ram diesel and have a few questions? The tank will be in the bed of my truck mounted behind in the cab. It will have a fuel transfer pump in the tank and would like to mount a lighted switch in the cab. My thought was to drill a hole in the box and run the hose from the tank though the hole and a gromit and tee in to the fuel filler hose. Also run a wire from the pump though the box under the truck along the frame and up the fire wall into the cab.I would wire the switch to the ignition so the pump will only run with the key on. I thought I might mount the tank on some rubber spacers were the tank touch's the truck bed(between the bed and tank and back of bed and tank). My questions are:
1)Does this sound like I have planned it out properly. Any thing to add?Any
better ideas?
2)If this is Ok, what size filler hose size tee do I need?
3)Where do I mount the switch. I thought up high where I see it if it was on. I
don't want to take my whole dash apart to mount a switch thou.

GTyankee 11-27-2010 03:18 PM

First of all, some states have laws concerning an auxiliary fuel tank, mostly the laws are more for gas & not diesel.
I can't directly connect my 2nd gas tank into my fuel system, because of smog laws in California. I believe if it was diesel then i could.
My lighted power switch is mounted on my dash, i have 2 of them, one for fuel & the other for my above cab caution lights
My tank is a combo tank, 30 gallon capacity with a tool box above that is large enough for something like hard hats & tools

The auxiliary tank that i bought, sits in front of bed, holds 30 gallons, & has its own pump, i have to open the top lid & put the nozzle into my Rams regular fuel access, ( like you would at the gas station), then i have to turn the power on at the dash, then turn on another switch that is at the pump & it pumps gas faster then the gas station nozzles.
the front box in the Rams bed is the auxiliary tank

The company that makes the tank that i used makes several styles of tanks with several different capacities.
They make a add on part that will automatically pump fuel from the 2nd tank to the first, when the primary tank gets down to a certain point, like 1/3 tank, as long as you have power to the pump. Another add on that they sell measures the amount of fuel that was pumped from the second tank, so you know how much fuel is still in the 2nd tank

MY friend set up his own system & it works well, BUT, on more than 1 occasion, he has forgot that his pump was pumping & he pumped fuel all over the highway that he was driving on.

The name of the company that makes this tank is Transfer Flow, the tank sits on skids, so that you can flush any trash that may build up in front or under the tank.
You can get the tanks through several places across the USA, including Northern Tool stores, many larger businesses have at least one tank in stock, they place that i bought mine from had 4 of them in stock
The website is

casper5280 11-27-2010 09:33 PM

Thanks for the reply GTyankee. The tank that you have is very similar to the one I have. Mine is 60 gallons, tool box on top and a small box beside tool box with pump in it. I'm in Canada and may have to check the laws regarding this I guess. I just thought that this would save the hassle and mess of a hose and spilling issues. I like the install of the switch in your truck very clean looking, mine is the Laramie and that is where the 4x4 wheel drive switch is.

jimv 01-31-2012 07:32 PM

does Dodge make a 55 gallon diesel taNK

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