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Old 12-18-2017, 05:15 AM   #1
Harleydodge
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Aux. Tank?

Just wondering if anyone out there is running an Auxiliary or larger aftermarket Fuel Tank, and if so, which one and how do you like it?

I am considering adding one to my 3500 CTD Longbed and am trying to decide on the best route.

The aftermarket replacement Tank from Titan looks good, and would about double my capacity.

There are (obviously) several other types of in-bed tanks as well. but I am Leary about having to manually pump fuel from an Aux tank into the factory tank, and also Leary of the the ones that "pump" for a fixed amount of time and then shut off. That just seems like a recipe for disaster to me.

In any case, what are you guys running, and what are your experiences?
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Old 12-18-2017, 05:38 AM   #2
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It seems there was a pretty lengthy thread about this topic not long ago. You might want to search for that one and see if it answers your questions

Here's one. http://www.keystoneforums.com/forums...iary+fuel+tank

And another. http://www.keystoneforums.com/forums...iary+fuel+tank

And another. http://www.keystoneforums.com/forums...iary+fuel+tank
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Old 12-18-2017, 05:41 AM   #3
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Titan would be my first choice..
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Old 12-18-2017, 06:00 AM   #4
Harleydodge
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Quote:
Originally Posted by xrated View Post
It seems there was a pretty lengthy thread about this topic not long ago. You might want to search for that one and see if it answers your questions

Here's one. http://www.keystoneforums.com/forums...iary+fuel+tank

And another. http://www.keystoneforums.com/forums...iary+fuel+tank

And another. http://www.keystoneforums.com/forums...iary+fuel+tank
Thanks X, I did search but for some reason It did not return those results. Must have been a Typo? anyway thanks, I knew I had read a bit about it on here at one time.
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Old 12-18-2017, 06:07 AM   #5
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You're welcome! And if I were to go with a larger tank vs. an aux. tank, Titan is the way to go, from everything I've read and heard. Javi nailed it.
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Old 12-18-2017, 06:25 AM   #6
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You're welcome! And if I were to go with a larger tank vs. an aux. tank, Titan is the way to go, from everything I've read and heard. Javi nailed it.
Yep, I think that would be my first choice as well,
That would about double my capacity.
Tripling it is also very tempting, but I'm trying to weigh the fact that with an in-bed option you are adding a bunch of connections that will possibly leak and or fail at some point.

I also wonder how well a gravity feed system will work and what kind of check valves come into play so that there is no overflow from the stock fill neck.
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Old 12-18-2017, 06:40 AM   #7
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I chose to buy an aux tank that is "L" shaped. It fits in the bed with the bottom part of the L going under my cross bed toolbox. It is the type that you have to add a pump of some type. I've got an electric pump (12 volt of course) and an inline fuel filter. It's a 42 gallon tank and with the 37.5 gallon tank that comes on the long bed Dually, I have right at 80 gallons for a trip. I don't mind having to get out and pump fuel, and usually plan it at a Pilot or other truck stop so that we can take a bathroom break and fill the coffee cups back up. I enjoy getting out to stretch and walking around a bit, so it's never been an issue. I have had to pump a couple of times while my wife holds an umbrella for me, but basically that is a pretty minor annoyance.
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Old 12-18-2017, 08:11 AM   #8
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Ours is the gravity feed RDS tank from Northern Tools. Here is the site: https://www.northerntool.com/shop/to..._541559_541559
Installation took about 35 minutes and has never leaked a drop in 100K miles. Ours actually holds 45 gallons if you fill it at a slight slant. There are many good options out there. Not one is "the best." Keep asking questions and decide what is best for you.
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Old 12-18-2017, 09:26 AM   #9
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I installed a 40 gal tank bought off Amazon Prime, mainly because I could get it w/ free shipping. Same tank from Northern Tool would cost about $150 in shipping. Cost was around $400+/-. This tank (don't remember brand) is only 9 inched front to back and fits in front of my tool box; both same height. Because the outlet is an inch or so above bottom of tank, I can only get about 36 or so gal in it when I refill. I ran a hose thru bedside (I have same truck, 3500 dually longbed), there is a hole there; and plumbed into filler neck. No pump, etc; gravity feed. You can buy the kit w/ the tank. It is just a tee that fits into filler neck and hose from tank attaches there. All clamps included. Tank has a shut-off valve at outlet. I put heavy rubber mat under and in front of tank to prevent rubbing on metal bed. Gives me nearly 70 gal of fuel which is close to 800 miles range towing. Have no need to fuel while 5ver is attached so much easier to find cheap fuel.
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Old 12-18-2017, 09:26 AM   #10
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Quote:
Originally Posted by notanlines View Post
Ours is the gravity feed RDS tank from Northern Tools. Here is the site: https://www.northerntool.com/shop/to..._541559_541559
Installation took about 35 minutes and has never leaked a drop in 100K miles. Ours actually holds 45 gallons if you fill it at a slight slant. There are many good options out there. Not one is "the best." Keep asking questions and decide what is best for you.
Glad to hear that notanlines. Good feedback, thanks.
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Old 12-18-2017, 09:28 AM   #11
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I installed a 40 gal tank bought off Amazon Prime, mainly because I could get it w/ free shipping. Same tank from Northern Tool would cost about $150 in shipping. Cost was around $400+/-. This tank (don't remember brand) is only 9 inched front to back and fits in front of my tool box; both same height. Because the outlet is an inch or so above bottom of tank, I can only get about 36 or so gal in it when I refill. I ran a hose thru bedside (I have same truck, 3500 dually longbed), there is a hole there; and plumbed into filler neck. No pump, etc; gravity feed. You can buy the kit w/ the tank. It is just a tee that fits into filler neck and hose from tank attaches there. All clamps included. Tank has a shut-off valve at outlet. I put heavy rubber mat under and in front of tank to prevent rubbing on metal bed. Gives me nearly 70 gal of fuel which is close to 800 miles range towing. Have no need to fuel while 5ver is attached so much easier to find cheap fuel.
I'll look that up as well. Prime member with them also. Thanks
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Old 12-18-2017, 09:30 AM   #12
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My F150 has a 36 gallon tank, and I always fill it up at at or just below half in order to avoid the pain of close to $100 filling it. I haven't been on a long enough trip with the trailer yet to see the mileage but I suppose at some point next summer I'll wish it was even bigger.
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Old 12-18-2017, 10:04 AM   #13
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I have also thought about getting a tank/toolbox combo from RDS. They are gravity feed but I plan on using a normally closed 12v valve in line so I can open and close it from the drivers seat.
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Old 12-18-2017, 10:18 AM   #14
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Just another point to consider, if you happen to decide on an in the bed tank, make sure its a DOT approved tank. The tanks that most tractor stores sell don't have the fittings for draining into a main tank because there're not DOT approved for that. They are made to put fuel in tractor or another piece of equipment.
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Old 12-18-2017, 10:54 AM   #15
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Just another point to consider, if you happen to decide on an in the bed tank, make sure its a DOT approved tank. The tanks that most tractor stores sell don't have the fittings for draining into a main tank because there're not DOT approved for that. They are made to put fuel in tractor or another piece of equipment.
Thanks Tinner, another good point, which I was aware of.
Where I live I need to have my truck safetied yearly (stupid, as it's not used at all for commercial purposes, but whatever...) and I will need to make sure that whatever I do end up doing, that it will still pass. I will be sure to talk to the proper authority before I make a final decision.
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Old 12-18-2017, 02:59 PM   #16
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Something else to check, a lot of the in bed aux fuel tanks are not designed for gasoline only diesel. The Titan replacement tanks are designed for both.
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Old 12-19-2017, 04:31 AM   #17
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Something else to check, a lot of the in bed aux fuel tanks are not designed for gasoline only diesel. The Titan replacement tanks are designed for both.
So you can run gas in yours also, I hope not! Lol!
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Old 12-19-2017, 05:17 AM   #18
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Something else to check, a lot of the in bed aux fuel tanks are not designed for gasoline only diesel. The Titan replacement tanks are designed for both.
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So you can run gas in yours also, I hope not! Lol!
Very important information for those who guzzle gasoline...

Back in the early 70's I drove a 3/4 ton GMC with a 305 cu inch V6 and put two 20 gallon tanks under the fenders.. that way I had 60+ gallons of gasoline, and at 8 mpg towing peanut trailers that was important... very few in-bed tanks are certified for gasoline..
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Old 12-19-2017, 07:29 AM   #19
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And if they are certified for gasoline, they're expensive....and the pumps are more expensive. The only thing cheaper is the cost of the fuel....gas is cheaper than diesel.
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Old 12-19-2017, 11:16 AM   #20
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I've had the same 50 gal. TransFer Flow tank in two trucks in the last 14 years without a problem leaking. Over 100K in the first truck and 75K+ in the second. I also plumbed a 70 gal. Transfer Flow tank for my brother who hotshotted RVs. With his it was the tank only not their automatic system. I used a 12 volt pump, ran the line into the vent tube, installed an auxiliary gas gauge in the cab and a on/off switch for the pump with a separate flashing light showing when the pump was on. He put over 300K on it without a problem
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