Auxiliary Tanks - Page 3 - Chevy and GMC Duramax Diesel Forum
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post #21 of 30 (permalink) Old 12-03-2012, 12:26 PM
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Location: N. Texas
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if you go with the rds 60 gal/toolbox setup put some beefier aluminum mounting tabs on it while its new. Mine didnt make it very long now they're all broken off and i gotta purge the tank with inert gas so it doesnt go boom when i get off my ass and tig some new tabs on. can't add anything on pump or plumbing since i just have a transfer pump setup on mine.

07 Gmc 2500 cc/sb 4x4 lbz,EFI Live,Snow Meth Inj., ATS tranny/converter. Airdog 150 ,GT4094va billet comp. egr delete with 3" bridge......custom mustard stain.
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post #22 of 30 (permalink) Old 12-03-2012, 01:06 PM
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I have a rds 60 gallon/tool box tank with a GPI transfer pump and it fits under my tri-fold cover.

If you use a fill rite pump you can't close the cover cause the discharge is on the top of the pump as where GPI discharges on the side

2010 2500HD LMM CCSB
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More to come one day!

2013 GMC 2500HD Denali CCSB
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post #23 of 30 (permalink) Old 12-03-2012, 01:14 PM
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Seebea has it right. I have toolbox with 50 gallon tank. Gravity fed. After fill up I wait till OEM tank is real low and turn valve and thats it. No pump works perfect. RDS tank through northern tool No regrets! Tool box and tank fit below rails, I have a trifold top fits over the top.
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post #24 of 30 (permalink) Old 12-03-2012, 01:22 PM
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Talking Fuel tank

Originally Posted by Gibby View Post
I just bought a 2012 Silverado 2500 crew cab, with a 6'6" box.

Does anyone know if this RDS auxiliary tank will fit with a fifth wheel hitch?

RDS Wedge-Shaped Auxiliary Fuel Tank 63-Gallon | Auxiliary-Transfer Tanks| Northern Tool + Equipment

its 19 inches wide at the bottom.

Or, any other ideas?
My 50 gal with tool box which looks just like SEABEAS only shiney alluminum, worked in my 2008 Shortbox Chevy D/A. I had a REESE manual slider hitch. If i recall right it was fairly close but definetly workd. I have moved on to a long box now.
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post #25 of 30 (permalink) Old 12-03-2012, 09:53 PM
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I have a custom made 60 or 75 gallon tank under my tonneau cover. Fits perfect. Can go a couple thousand miles with it and my side tank. Also got mine plumbed in direct and have a ball valve on it.

Id perfer a nice tool box/tank combo if they werent $1200+ up here


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post #26 of 30 (permalink) Old 12-10-2012, 05:50 PM
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I know the trend seems to be in-bed tanks...but with the 6'6" box, I went with a transfer flow 56 gallon replacement doesn't interfere with anything around the frame/exhaust, and gives me my whole bed to haul stuff in....

2006 LBZ Chevrolet Duramax 2500HD CCSB - 227,xxx mi
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post #27 of 30 (permalink) Old 12-12-2012, 06:24 PM
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I am looking at getting a small aux tank that will fit under my RKI toolbox. I only need about 20-25 gallons. I was going to wire in pump and handle so that I can either put it in my truck when I am getting low or use it for other equipment. Of course, I will wire in a shut off switch in the cab so no one will steal my diesel, though.

Anyone know of a small aux tank like that?

2011 GMC 2500HD Duramax Z-71 CCSB SLE
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post #28 of 30 (permalink) Old 12-30-2012, 12:58 AM
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We also bought our tank and gravity flow pump from Northern. My dad also wanted one, so ordered both at the same time and split the shipping cost(same cost to ship 2 for 1!) We love ours. Pull a fifth wheel and we bypass alot of the traffic at the filling stations. Best investment we ever made!
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post #29 of 30 (permalink) Old 01-01-2013, 08:11 PM
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I like TransferFlow tanks. They make OEM replacement tanks and in-bed tanks. I have both and am very happy.


Jeffrey Steinberg
Scarsdale, NY
2013 Chevrolet Silverado 3500 HD Dually
61 gallon Transfer Flow instead of stock.
37 gallon Transfer Flow in bed
Pace-Edwards Jack Rabbit Full Metal tonneau cover
B&W Turnoverball Gooseneck / companion hitch
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post #30 of 30 (permalink) Old 01-01-2013, 08:18 PM
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the person i work for uses the transfer flow tanks in 4 of his trucks. they are the 50 gallon tanks and work great. it gives a digital read out of the fuel gallons in each tank and automatically transfers fuel from the aux. tank to the main tank.
Transfer Flow, Inc. - Aftermarket Fuel Tank Systems

2006 gmc 3500 xcab lb, with the LBZ.
with air dog lift pump, race valve, egr delete, and efi reprogram, thanks to husker diesel.
84 gal fuel cap.34 main and a 50 gal aux transflo system.
20k curt 5th wheel, 20k goose neck.
still stock. 4x4. 430,000 miles and counting.
transporting new units from factory to ia. dealers and ship.
engine replaced at 404,000 mi with one with 118,000 miles.
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