Under bed Aux fuel tank - Diesel Forum - TheDieselStop.com
1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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post #1 of 12 (permalink) Old 12-14-2008, 07:57 AM Thread Starter
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Question Under bed Aux fuel tank

any suggestions??

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03 F-250, Auto, CC/SB, 3.73LS, XLT FX4, Tiejtan Front Replacement, Ruenel Rear Bumper, Rancho Leveling Kit, Airbags, Dynatrac Free Spin / Warn Hubs, Dynatrac Front Dif cover, Tire Gate, Mag-Hytec Rear Diff, 46 gallon tank, Cryo Treated Rooters and Steel Braided Brake Lines, 203 T Stat and Billet housing, Marinco, Auto Meter: EGT, Boost and Tranny, 4" SS Turbo Back, pre pump and regulated return; HP X, AIS, AIH Delete, Banks IC, DP Tuner - 60 HP Daily / 80 HP Tow (both no codes) and the best for last - BTS with 6.0 cooler!
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post #2 of 12 (permalink) Old 12-14-2008, 08:41 AM
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You want an additional fuel tank? Or just a larger one? I believe Transferflow makes quite a bit larger tank for the short beds, it fit's where the stock one is.
Otherwise, under the bed where the spare goes you could fit one, others have done that, though I do not know what tanks they used.

Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics! '03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4

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post #3 of 12 (permalink) Old 12-14-2008, 12:29 PM
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I don't think anyone makes an under-the-bed extra diesel tank for our trucks. Some folks have cobbled together the fabrication required to mount a fuel tank where the spare tire resides, but that requires lots of fabrication. Some have used the diesel tank from an Excursion, which is about 40 gallons and is behind the rear axle.

But that's a heck of a project, so most people settle for replacing the stock tank with a bigger one from transferflow.com

"For 1999-2007 Ford crew cab and extended cab pickups with a 6 1/2 foot bed, a 46 gallon replacement fuel tank is available."

Click on this link: Ford pickup replacement tanks

My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it a coupla years ago. I drove a hand-me-down 2003 F-150 SuperCrew 4.6L 2V for a while, but it was unacceptable for towing more than a rowboat. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat that tows my 5,000-pound TT like a dream.
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post #4 of 12 (permalink) Old 12-14-2008, 01:26 PM
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Transferflow, has replacement tanks for under the bed. Up to 47 gallon on a shortbed and up to 60 gallon if you have a long bed.

Ford pickup replacement tanks
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post #5 of 12 (permalink) Old 12-14-2008, 09:14 PM
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Hey SMoKEY,, your right!

Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics! '03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4

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post #6 of 12 (permalink) Old 12-15-2008, 01:27 PM
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I got a 55 gallon Aero Tank under my bed as a replacement. They also make a 55 gallon for the short beds too. I know because I installed one on my brother in laws '01 F250 SB. The price is good too. AeroTanks-we specialize in auxiliary fuel tanks.

Early 99 F350 XLT 4x2 CC LB SRW 6sp
Terminator modded HPOP, CCV, 203 T, SS HPX, ITP OBA, intank/prepump mods, Ford AIS/zoodad, ITP regulated return, 08 Differential Cover, Autometer Pyro/Boost, 4" MKO straight-piped, Diesel Site A/C Bypass, DieselSite Coolant Filter Kit, DP F5 (stock, no start, high idle, 80e), Aerotank 55 gallon midship tank

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post #7 of 12 (permalink) Old 12-15-2008, 03:01 PM
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I would like to see what the 55 gallon Aero tank looks like in a short bed (like mine). My next mod will be a larger tank, but the 47 gallon Transferflow was the only one I thought would fit.

Current truck: 2002 PSD 4x4, CC, XLT, F350 dually, 4.10 gears. Air bags, 6.0 trans cooler, Fleetrite ELC, ISSPRO gauges (boost, EGT, trans, fuel pressure), PHP Hydra, full EBPV delete (pedestal & outlet), CNC Fab HP & HPX lines, Riff Raff FRX, Riff Raff IC boots, CCV mod w/catchcan, Reese Titan, AIS, ITP pre-pump filter kit, in-tank mods, Redhead steering box.

Old truck: 2000 PSD 4x4, ext cab, XLT, F-350, auto, V-code springs, air bags, coolant filter, 203 thermostat, CCV mod, Fleetrite ELC, DB Alternator, DB high-torque starter, Tru-cool Max-cool trans cooler, B&M trans temp gauge, 47 gallon Titan tank, ITP pre-pump filter kit.
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post #8 of 12 (permalink) Old 12-16-2008, 10:25 AM
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AeroTanks makes auxiliary tanks which replace the spare tire. They have installation kits as well which are fairly simple to install if you've got more than a single screwdriver in your garage. Personally though, I don't like the idea of wandering around without a spare tire.

- '07 F250 Diesel DRW

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post #9 of 12 (permalink) Old 12-16-2008, 03:38 PM
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I looked into installing an aftermarket auxiliary fuel tank and the only thing I didn't like was that they hang lower than the factory. If I remember correctly they were lower than the trany and I was afraid of snagging it when hunting.

I installed a fuel tank tool box combo. It has a 60 gallon capacity and still allows me to store some tools. It was only around 700 from Northern tools. It dumps into the fill neck of the OE tank. I've had it for around 3 years and haven't had any trouble or leaks.


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post #10 of 12 (permalink) Old 12-17-2008, 02:14 PM
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Transfer Flow

Transfer Flow are top of the line!

2003, F250, Super Duty, Super Cab, 7.3, Auto, 4X4 Silver, 2" lift in front only, 46 gal fuel tank, Billet Grill, 285X75X16 BFG MT, Bilsteins, Firestone Air Rear, B&W Gooseneck, We call it the "Silver Knocker"
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post #11 of 12 (permalink) Old 12-17-2008, 05:04 PM
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Try Titan Tanks as well. They use High Density Cross-Linked Polyethylene in their tanks, and are injection molded:

Ford Large Capacity Diesel Fuel Tanks for Pickup Trucks ~ TITAN Diesel Fuel Tanks: The Leader in Aftermarket Fuel Tanks

CC SB's can hold 51 gallons with their tank....

2002 F250 SuperCab Longbed CUMMINS 6Spd True Blue
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post #12 of 12 (permalink) Old 12-17-2008, 05:57 PM
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Post Not a fan of Transfer Flow.

Originally Posted by reba View Post
Transfer Flow are top of the line!
I wouldn't take one if you gave it to me. They are made of aluminumized steel which can rust causing problems for your injectors.

Look Here. This company doesn't make an under the bed tank, but they do build custom built tanks and use all aluminum or stainless steel.

The only connection that I have with this company is that I am a customer who has bought a tank from them.


2008 F-450 JOB-1, 4 X 4 with 4.30's, auto with manual transfer case with factory cup holders. All options except sunroof and nav. Line X with Extra. 24K Draw-Tite Signature Series Fifth Wheel Hitch. 65 Gallon KSH Marine fuel/tool combo in bed. Viair 480C compressor with 8 gallon tank. Hadley Air Horns hooked up to Auto Mate alarm. Chime/Light Killer Mod. Polished Job-1 exhaust tips. Transmission upgraded to JOB-2 filter, pan, and lines. External filter eliminated.


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