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Old 01-23-2014, 06:01 PM   #1
Rick R's Avatar
Join Date: Sep 2012
Posts: 50
Auxilliary fuel tank for TV

We will be pulling our 2013 Flagstaff 30WFKSS from our home (SD) to Texas in April so I figure it's not to early to ad more mods. This time to the 2006 Silverado 2500HD 8.1L. We made the same trip last spring and the only major issue was the small (26 gallon) fuel tank and 7-8 mpg when towing. Some of the smaller towns where I needed to refuel were difficult to impossible to get in and out without leaving part of the trailer behind. Almost had to block and unhitch, go to gas station and fuel then return re-hitch etc a few times. Not an exciting proposition.
I looked at a larger replacement fuel tank, but at about $1,400 plus freight plus dealer installation @ $97.00/hr plus tax I was nearly at $2,000.
So...I bought a Moeller below deck 19 gallon tank and am now in the process of installing it in the rear of my box. The truck is a crew cab with 6.5' box and topper. I put in a slider deck last fall and so far love it. I designed an angle iron base for the new tank that would clear the slider deck. The tank will be vented to the outside of the topper and include a roll over vent check valve. I bought an electric fuel pump with a capacity of 140 gph on ebay for around $55. All metal points (fill neck, vent, sending unit, etc.) will be grounded to the frame and the line to the fuel pump will have a shut off valve at the tank.

Comments/questions appreciated
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Rick R is offline   Reply With Quote
Old 01-23-2014, 06:37 PM   #2
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Join Date: Feb 2012
Posts: 116
I put an extra tank in my Tundra for the same reasons you are. I paid more, but I love it. I documented it at the link below.

Link - Transferflow tank, fuel cans, or multiple stops? - Page 2 - - Toyota Tundra Discussion Forum

The only question I have is how are you going to get the gas from the tank to your truck? Most states do not allow to have an active connection between the bed mounted tank and the under vehicle tank when gasoline is the fuel being used. Meaning it must have a manual transfer pump.

EDIT - Below is the link to the "special permit" my tank has.
Link -

Kf4mnc is offline   Reply With Quote
Old 01-23-2014, 09:52 PM   #3
Rick R's Avatar
Join Date: Sep 2012
Posts: 50
Kf4mnc-nice tank setup. I'll bet you love the extra capacity on long trips. My brother-in-law has a similar setup he's been using for 3 or 4 years and it works very well for him. Oh, your link reminds me that I need to get a fire extinguisher mounted inside the topper. I plan to make everything quickly removable so I can have more room in the back if I'm not on a long trip. The sides and back on the bed slide are easily reset to the original position by loosening a few screws.
I'll use the electric fuel pump with a hose long enough to put into the fill door on the truck, maybe a bit longer so I can fill a gas can on the ground. I have a couple of rotopax 2 gal. cans but I usually put premium in them for the Honda 2000's. The fuel pump is rated at 140 gph, so I should be able to empty the tank in around 10 minutes and still have time to take a walk after.
Costs so far.........
Install Kit-----------$ 73.00
140 gph fuel pump--$ 49.00
Misl. steel----------$ 35.00
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