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Old 10-01-2008, 05:54 AM   #1
2 Rivet Member
2007 27' Safari FB SE
Cape Coral , Florida
Join Date: Sep 2008
Posts: 20
Auxillary diesel fuel tank

I just purchased a 2008 Diesel Duramax GMC Sierra TV for my '07 Safari SE 27'. I would like to add an extra fuel tank to the TV to get further between fuel stops. Any suggestions?

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Old 10-01-2008, 06:20 AM   #2
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Thinking the same thing. Take a look at and

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Old 10-01-2008, 08:42 AM   #3
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Posts: 295
A couple of months ago I installed an aluminum 91-gallon RDS tank from Northern Tools. The cost was about $600 with shipping. It really works well.
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Old 10-01-2008, 10:39 AM   #4
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1979 30' Argosy
Havelock , where we park it
Join Date: Jun 2003
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Hello... We just sold ours here in Canada for $450 Canadian... it was the 91 gallon auxillary fuel tank (aluminum) from Northern Tool... we loved it when we had oiur 5th wheel... but we did not need it with this newer truck...
Marvin & Annie
Niki (fur baby)
1979 Argosy 30 (Costalotta)
WBCCI 10103
"Happiness is a warm Puppy" Charles Schulz
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Old 10-12-2008, 09:04 AM   #5
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2005 28' Classic
Port O'Connor , Republic of Texas
Join Date: May 2006
Posts: 217

I have a 68 gal. aux. tank which is wired with a direct switch on the dashboard that works like the old style tank selector switch. I can run out of the auxalury tank first then swithc to the main tank. Both tanks have gauges visible from the drivers seat. This gives me a range of approx. 1200 miles, towing my 28 Classic. Trust me , thats farther than my kidneys will let me drive

Heres a link to the company: Aluminum Tank & Truck Accessories LLC. - Fuel Tanks & Fuel Systems
2005 GMC CC D/A
2005 28' Classic
WBCCI # 3133
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Old 10-12-2008, 10:00 AM   #6
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1975 31' Sovereign
1980 31' Excella II
Sprung Leak , North Carolina
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I use the Transferflow tank(s) on my truck. I swapped out the original factory front tank (19 gallons?) for the big 40 gallon Transfer flow tank. Increased my range by about 300 miles to a total of over 800 miles. Haven't decided if I want to do the back tank...I would have to move the spare. The in bed tank/toolbox combo's work very well too, but every now and a again I need the bed completely cleared. We do have one of those on the farm truck, however it has a 4.58 rear end and only gets 10-11mph...on a good day.

__________________ many little time...
Why are we in this basket...and where are we going
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Old 10-14-2008, 09:36 AM   #7
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1999 34' Limited
Darien , Wisconsin
Join Date: Mar 2008
Posts: 116
I also recommend Transferflow, I have a 100 gallon tank in my F-250 diesel, and the truck itself has two seperate 19 gallon tanks, that gives me a range of over 1800 miles which is sure nice, there's a switch under the dash that switches from the big tank to the trucks regular tanks and it works right off the regular fuel gauge. it's nice to see it on Full for hours at a time..
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Old 10-24-2008, 08:02 AM   #8
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2011 30' Flying Cloud
North Falmouth , Massachusetts
Join Date: Jan 2008
Posts: 138
Inexpensive diesel reserve

I have the same vehicle. We travelled 10,000 miles this Summer to Montana and the Gaspe Peninsula towing our Safari 27FB. I carried 4 five gallon diesel "cans", tightly fitted with O-rings for the vent and fill cap. They were held in place in a 1/2" plywood box painted with epoxy paint. We had no leaks, mileage did not suffer from the added weight, and we used two of the tanks once in the 10,000 miles. Our range on a full tank is about 300 miles, much further than I want to travel without stretching or walking the dog! Dick & Claire
Dick and Claire Wiklund
North Falmouth, Massachusetts
"Judgement is based on experience and experience is based on poor judgement"
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Old 10-24-2008, 09:40 AM   #9
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Posts: 295
The reason I got the auxiliary tank is to keep from having to stop once a day to refill with the trailer in tow and compete with the truckers for a position at the pumps. The only time I ever put a dent in my Airstream was trying to maneuver at a fuel station.

Now, with the auxiliary tank, I only refill when I'm unhooked and it's easy to maneuver around. Even though I can get over 400 miles with my truck's factory tanks, when I'm on the road, I often don't unhook overnight. But at least every three days or so, I do unhook, and that's when I refill when going out to eat. I find this a lot less stressful.

The only exception is when I see relatively cheap diesel somewhere. Then I refill unhooked or not to take advantage of the savings, which sometimes can be a lot.

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