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Old 08-09-2010, 10:34 PM   #15
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wingnut60's Avatar
Join Date: Aug 2004
Location: Burleson, TX
Posts: 2,349
Like psaint, I have an aux tank in my Ford 450--had it first in my '07 350 for over 70k miles, then put it in the new 450. RDS 60gal tank/toolbox. Has the gravity feed and never overflows--I wondered about that and have opened the tank several times when everything shows full, no overflow. The checkvalve keeps this from happening.

As to the 'miles to empty' and such--the computer just shows MTE based on last tank usage x full tank---shows about 290-390 when towing, and 400-480 when not towing. Never changes much til the aux tank runs out, then the MTE starts going down. This has never been a problem to me--truck tank will stay full til aux tank runs out, except that heavy towing will use fuel faster than it will gravity feed. Tow all day, tank shows about 1/2-5/8 full, stop for night, get up next morning, tank shows full--neat.
There are two real great positives to having the aux tank: 1) when heading out on long trips, I check gasbuddy.com for low diesel prices along the route and can save up to 20-35 cents/gallon this way; and 2) can fill truck many times when camping and the trailer is not on the truck--much easier to get in stations. Negatives: most pumps have a max $$$ and will have to reset while trying to get up to 90 gallons.

Example of potential savings: was in Colorado for 2 weeks and had to make a run to Denver twice to airport to pick up/drop off my son flying in from TX--cost of fuel in Leadville $2.95/3.05; filled in Denver at $2.63. 80+gallons at 32 cents saving = $24.00. This happens all time, but I put 30-50k a year miles on trucks, so it adds up. If you don't drive as much as I do, then the payback is longer. I now have had the tank for at least 118,000 miles driving--118000 miles at 10 mpg ==11800 gallons x say 20 cents/gallon = $2360. Don't drive as much, maybe extra tank is a toy? But just the convenience of filling up without the trailer on is worth something.
Check out these aux tanks at www.northerntool.com


'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died
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auxiliary tank, deisel, f350, ford, fuel

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