Has anyone installed an auxiliary fuel tank in the bed of their truck?I have a 2019 F250 diesel crew cab with the short bed.Just wondering if you had problems and solutions.Thanks.

You'll also need to install an electric pump if the auxiliary is connected to your factory tank.

I had a 100-gallon Transfer-Flow tank in a long-bed 2008 Ford F350 diesel. One small problem (if you even call it that) was that the amount of fuel on the display was always less than what was in the tank -- I would have about 20 gallons left when it displayed 0 gallons. Another slight problem was that leaves and debris that collected in the one-inch space behind the tank were difficult to remove.I recently traded for a 2021 long-bed diesel, and want to get another Transfer-Flow when one becomes available for the 2021 Fords. I do it for peace-of-mind; so that I can tow for three for four days without constantly having to worry about fuel; so that I can reach Yellowstone (for example) at the end of a driving day and still enjoy driving around for the next couple of days without having to think about visiting a station. To me, that's worth 50 cents a day spread out over ten years. You do NOT get a transfer tank to for the purpose of finding cheaper fuel (you never save enough to get your money back), but a side benefit is that you have the option of topping-up whenever you happen to see a good price, or you can keep on trucking though a state where fuel is more expensive. But, as I said, that is secondary to peace-of-mind. Metal transfer tanks will have a good deal of water condensation. I put a water-separation filter in the line coming out of the transfer tank. That helped to keep water of out the main tank and not overtax the truck's own water-separation filter.

Go to Transfer Flow dot com and run your truck through the options. You might be able to get a larger tank to replace the one you have now, or one to sit under the truck bed somewhere. They also have a lot options for an in-bed tank, anything from a fuel only tank to one that shares space with a toolbox..

I very much agree with Roy's comments, save for the leaves part; my tank is fully under my tonneau cover. I too have a steel tank but don't have an additional water filter and haven't had any water in fuel issues, even after leaving it empty all winter. I put an inline electric fuel shutoff with a dash switch for easier control of when the auxiliary flows into the main.

RoyF wrote:I had a 100-gallon Transfer-Flow tank in a long-bed 2008 Ford F350 diesel. One small problem (if you even call it that) was that the amount of fuel on the display was always less than what was in the tank -- I would have about 20 gallons left when it displayed 0 gallons. Another slight problem was that leaves and debris that collected in the one-inch space behind the tank were difficult to remove.I recently traded for a 2021 long-bed diesel, and want to get another Transfer-Flow when one becomes available for the 2021 Fords. I do it for peace-of-mind; so that I can tow for three for four days without constantly having to worry about fuel; so that I can reach Yellowstone (for example) at the end of a driving day and still enjoy driving around for the next couple of days without having to think about visiting a station. To me, that's worth 50 cents a day spread out over ten years. You do NOT get a transfer tank to for the purpose of finding cheaper fuel (you never save enough to get your money back), but a side benefit is that you have the option of topping-up whenever you happen to see a good price, or you can keep on trucking though a state where fuel is more expensive. But, as I said, that is secondary to peace-of-mind. Metal transfer tanks will have a good deal of water condensation. I put a water-separation filter in the line coming out of the transfer tank. That helped to keep water of out the main tank and not overtax the truck's own water-separation filter.Give Transfer a call and they will recalibrate your tank gauge.

Auxiliary fuel tank | Good Sam Community

markc
Explorer
May 28, 2021
Bionic Man wrote:
markc wrote:
Bionic Man wrote:
Not trying to be "that guy", but there are many threads on this. If you search, you will find the same answers. Those of us that have them for the most part really like them. Those that have never used them will talk about how it is a waste, and you have to stop for biological reasons, so just stop when getting fuel. You will almost certainly even find someone who posts a photo of a single yellow 5 gallon can that they claim is equivalent to a transfer tank......

Anyway, I have a 60 gallon RDS tank/tool box combo. Love it. Great investment. No need for a fuel pump, gravity feed works fine. Choose where you stop instead of stopping when you have to.

Nothing here on a search of auxiliary fuel tank. Thanks

They were a bit harder to find than I thought they would be, but they are there. Here are two.

1

2

Some of the 1 replies are funny. Thanks
Bionic_Man
Explorer
May 28, 2021
markc wrote:
Bionic Man wrote:
Not trying to be "that guy", but there are many threads on this. If you search, you will find the same answers. Those of us that have them for the most part really like them. Those that have never used them will talk about how it is a waste, and you have to stop for biological reasons, so just stop when getting fuel. You will almost certainly even find someone who posts a photo of a single yellow 5 gallon can that they claim is equivalent to a transfer tank......

Anyway, I have a 60 gallon RDS tank/tool box combo. Love it. Great investment. No need for a fuel pump, gravity feed works fine. Choose where you stop instead of stopping when you have to.

Nothing here on a search of auxiliary fuel tank. Thanks

They were a bit harder to find than I thought they would be, but they are there. Here are two.

1

2
JRscooby
Explorer II
May 28, 2021
Some trucks, and some jobs for the truck, in some locations, hauling lots of fuel makes sense. Back when I was running 427 GMC, and working it hard, a lot of days a 50 gallon saddle on each side would not last all day. And often that 200 gallon tank on the F 750 was worthwhile. But now, for what I use the pickup for a extra gas tank even for free would not be worth the cost.
If somebody only hears cheers for them they are less likely to really think about their need for the tank.
markc
Explorer
May 28, 2021
Thanks again for the replies, lots of help.
markc
Explorer
May 28, 2021
Bionic Man wrote:
Not trying to be "that guy", but there are many threads on this. If you search, you will find the same answers. Those of us that have them for the most part really like them. Those that have never used them will talk about how it is a waste, and you have to stop for biological reasons, so just stop when getting fuel. You will almost certainly even find someone who posts a photo of a single yellow 5 gallon can that they claim is equivalent to a transfer tank......

Anyway, I have a 60 gallon RDS tank/tool box combo. Love it. Great investment. No need for a fuel pump, gravity feed works fine. Choose where you stop instead of stopping when you have to.

Nothing here on a search of auxiliary fuel tank. Thanks
M_R_E_
Explorer
May 28, 2021
I have a '16 Ram 2500 short bed CTD. I put in a Better Built HD 36 gal Black steel transfer tank . Love it , it is 11' deep x 17' high x 46' wide. You don't need a fuel pump. I use a 3/4 x 6' siphon hose works great. I wanted a black one, so I bought it on amazon from Northern Tool. If you want a white one , you can get it from Tractor Supply.
Sagebrush
Explorer
May 28, 2021
Tool box combos are very nice. I have a 50 gallon tank with a separate tool chest box. Lots of room, the storage box sits on the bed floor. I fill that sucker up with tools, oils, grease, ratchet straps, draw bars, hitch cover, jumper cables ect. They make L tank combos with 100 gallon capacity, but the storage inside is much less. ATC brand was my choice. I added the transfer pump and filter for my Kubota tractor. ATC had a nice option list, tank and box was made to order. Gravity feed is the best method IMO. I've done the selector valve switch with the in tank pump/sending unit, it wasn't worth the hassle.

Having the extra 50 gallons pushes my towing range out to 800 miles or more. Most of my trips are under 500 miles, so I enjoy not having to stop for fuel with the 5th wheel attached. I can run to the nearest beaches and come back on one fill up. Its a nice luxury. :)
Michelle_S
Explorer III
May 28, 2021
Word of caution for newer GM owners and gravity feed system. You will need something to clear codes, because the newer GMs will set a pending code and your fuel guage will drop to empty if you travel approx 100 miles and the computer does detect any drop in fuel level. If the pending code is not cleared by the end of the next 100 miles it will set a Check Engine code.
JRscooby
Explorer II
May 28, 2021
valhalla360 wrote:
TimnJo wrote:
I too have a steel tank but don't have an additional water filter and haven't had any water in fuel issues, even after leaving it empty all winter. I put an inline electric fuel shutoff with a dash switch for easier control of when the auxiliary flows into the main.

Water condensation in a fuel tank is a bit of a myth. Just enough truth to make it believable.

Ran the numbers one time for our 220gal tank on our boat. Over the course of a 6 month winter, if the tank was almost empty and air changed over completely every day and 100% of the moisture condensed (ie: very conservative assumptions), the amount of water that would condense out would be equivalent to a few pea size drops.

Water does get into boat fuel tanks but usually around fittings that are mounted flush to the deck or it came with the fuel.

It's not going to hurt to add a filter but if you find water, it's unlikely to be from condensation.

Back in the day, when asphalt haulers would park for winter the guys that would leave the truck low on fuel would need to change fuel filter the first day of hauling. I would make sure mine was full, not to save the filter but because it was a help for the time between start of work to first payday.
Dump truckers prayer; Lord if you get me thru February I can March for myself.
2naEagle
Explorer
May 28, 2021
I have had a RDS aluminum transfer fuel tank toolbox combo with a RDS gravity flow kit on three different super duty trucks. 2008, 2017 and 2020 all CCSB SRW. It has been the very first thing I installed. Pretty much stop where I want when I want. I have the RDS #74026 50 gallon.

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