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Old 05-18-2017, 02:45 PM   #1
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Gravity feed or transfer tank?

I've decided to add an RDS 60 gallon fuel tank/tool box combo to my 2017 Dodge 3500 dually. I've narrowed my choices down to the gravity feed model 73326, or the transfer tank model 72744. Both have full length tool box lids, and both are 55"L, 20"W, and 22 1/2 tall. My truck is a long bed, but I want as much room and as little weight in the back as possible, so I'm sticking with a 60 gallon tank because they are only 20" wide. Larger tanks jump up to 24" or 30" wide. I don't plan to put a tonneau on the truck, so I don't mind that the tanks are taller than the bed rails. The transfer tank is about $400 more than the gravity tank, and I'm willing to eat that upfront cost.

I like the simplicity of the gravity feed tank plumbed straight into the filler neck of the truck, although I see some people complain about slow feeding, and the slight danger of a spill.

I also like the idea of having a transfer tank with 8 gpm pump, & 10' hose that I can use to refuel my truck and other vehicles as well. As I mentioned above, the transfer tank has a full length tool box lid, so the pump & hose are protected from the elements. However, a friend warned my about an increased danger of fuel contamination from the transfer tank, especially from the hose & nozzle.

I've never owned a diesel before, so I'm learning "on the fly." Am I missing something? Is there some increased danger to having a separate transfer tank that I'm not seeing?
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Old 05-18-2017, 03:15 PM   #2
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My gravity feed works perfectly. Never had a spill or slow feed.

JMHO I do not see a need for the transfer.
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Old 05-18-2017, 06:33 PM   #3
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xtasee, I guess it's just for the cool factor of being able to fuel up other vehicles in need. I'm a retired soldier and a retired Texas cop, so I still suffer from "rescuer fantasies."

If I do go with a gravity feed, it would give me the option of getting the lower profile 60 gallon tank that RDS offers (#72743). It is only 19" tall, which would leave me the option of installing a tonneau someday if I ever feel the need to. The toolbox is only 6 1/4" deep, versus 10" on the taller tank, but I can live with that.
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Old 05-18-2017, 08:26 PM   #4
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That sounds exactly like the one I bought. I did put a tri-fold over it and I also have a Pull-Rite slider hitch. Everything barely clears each other including the when the tri-fold is folded, and the shock on the hitch...

I am happy with the choice but also understand your fantasy. That could be a strong reason for the transfer option.
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Old 05-18-2017, 08:26 PM   #5
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Gravity feed or transfer tank?

Why not have both. The same transfer setup tank has all the fittings for an auxiliary tank. Plumb it in as an auxiliary tank buy the transfer hose pump and nozzle and you have both.
When you don't need the auxiliary tank shut the petcock and you have a full transfer tank.


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Old 05-18-2017, 08:35 PM   #6
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The rds 72548 is 60 gallons same size and does both and is a tool box combo as well.


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Old 05-19-2017, 01:21 PM   #7
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Just installed the Titan replacement on my Ram 3500. Not a bad install, perfect fit, not modifying or running for parts. Almost 60 gals now. Can always add the spare tire tank or in bed if needed, but 60 gals should be good. Might be something to look into, leaves my bed completely free.
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Old 05-19-2017, 04:59 PM   #8
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In order for my gang box to open with the tonneau cover on I had to block the gang box forward 10". This thread made me realize what I should do with the space I've created. They make a 40 gallon auxiliary tank that's 9-10" thick. That's my next project.
I have to stop reading these threads, I already have more to do than time allows.
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Old 05-19-2017, 09:41 PM   #9
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No thanks required, Foxfire. I'm just glad I could help you add another expensive project to your to-do list!

I decided to keep it simple, so today I had a local shop order an RDS 72743-- the gravity-feed, low-profile 60 gallon tank/toolbox. He expects to get it on Monday, and have it installed in two hours. He's charging me $1001.32, which is as cheap as I could do it myself. Tractor Supply sells the tank for $779, plus $137 shipping, and $70 for the installation kit.

Thanks for all your input, guys. Now I can focus on fixing my a/c issues.
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Old 05-20-2017, 03:08 AM   #10
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I installed a 72 gallon tank that also allows for our roll up cover and love it. Also installed the Freedom Fill automatic so when we get to 1/4 tank it fills it back up to 3/4 tank. Has a separate fuel gauge. We can now carry 109 gallons so no need to stop until we unhook. Best investment I made but the wife still doesn't agree but she isn't the one trying to find the fuel stations.

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