i'm grateful for my 52 gal tank on my 5500. having to stop at the weigh stations, fuel is heavy and takes away from what i can haul, sometimes i can not even run with a full tank.

anyway it is good to get out an exercise with a walk every 3-4 hours.

 

I haul RVs for a living, I have a 115 Gal tank in the bed and stock is 35 total of 150 gals. It's nice to be able to run up to 3000 miles while empty. I can run around 2000 miles when pulling.

In my case I run alot of Canada and never buy any fuel there.

 

I just had my stock tank replaced with a Transferflow 56 gallon tank...I'm anxious to see how far I get between fillups...I was getting 500 miles, but I'm predicting 800 to 850 now......Ben

 

RDS site has a "Scatch & dent" section. I found a 91 gallon aluminum tank that sols in Norther for $500, fo $200, plus $100 fright. Diffrrences in fuel cost can pay for it. Cheapest diesel now in Houston is $2.50, per mapquest/diesel. On a lonf trip, diesel is $2.75 to $2.90.
Bacxk in $5 diesel days, Mexico was selling for $2 or so. Those days are gone, now $2.65 last time there.

 

where is that at?

 

On the RDS, I think you have to call them for the scratch & dent group, or send e-mail. It has been 3-4 years since I got mine.
I was appaled when I went to buy diesel at $2.52, only to find that was gas.Seems Mapquest got that wrong, as the sign posted was misleading.
I paid 2.69, still not bad. 2.65 is about the lowest somewhere here in this big city.

 

RDS does not sell retail due to their relationship with vendors. They may, as stated, have some deals on scatch and dent - - you can call them. Great product at less than 1/2 of some of the other "gold plated" (at least they must think they are) tanks from other manufacturers. Yet, the quality is super. Mine is now 7 years old and still looks great and I use it a lot. Plus, it is gravity fed per fed instructions and it works super with no pumps, no switches, just a manual shut off valve. Love it. If they do not have anything, you would need to check out Northern Tools. Tools also carries the gravity install kit at a very reasonable price.

http://www.rdsaluminum.com/auto-auxiliary.html

Bob

 

Cool.

Bob, on yours do you have the problem with it overfilling your stock tank?

 

NO - - I don't know what you are driving and I don't know when this occurred, but somewhere along the line the filler cap was changed to allow breathing "in" only. This allows for the tank to fill with air as the fuel is used. It will not allow fuel to come out even when filled to the brim. I have heard of people having a bit of seeping due to improper sealing. A new filler cap took care of that. I have a locking cap which I made sure only vented "in" when purchasing. If you are uneasy with it, you can leave the valve in the off position until your gauge is reading down to whatever, then open it and continue driving until you are near full. I leave mine on all the time. When my fuel guage starts moving off of full, I know the aux tank is empty. I then have about 325 miles if towing before I start looking. If running solo, I still have a good 600 miles before starting to thing about refilling. This gives me a good 850 miles towing on one fillup with plenty left to not worry about finding fuel. With a little planning, this many times allows you to complete skip fueling in a state with high fuel taxes.

Bob

 

COOL!! On my 2001, the problem is a vent on the top of the fuel tank module called the 'rollover valve' and on mine it allows air in and out while the truck is rolling down the road. However, it's function is to not let fuel out of the tank when the truck rolls over. Not sure how it functions, might have a float. But that is what concerns me about putting an rds aux tank on there. It might just overflow... Do the RDS tanks have a vent on them? I could plug the rollover valve with a plug and get a cap like yours if the rds tank has a vent on it. I am just about ready to order one!!!

 

I think all tanks have the rollover valve on the tank. Yours might also have the one way cap - - not hard to check it. Buy a locking cap that is one way. Diesel is expensive, and when you have about 90 gallons on board, it does not take a calculator to figure how much money is riding around with you when they are both full.

Bob

 

I have an '03, 3500, SRW & in '04, I travelled thru Elkhart, IN. & had a Dually Depot 115 gal. aux. in-bed tank installed in my truck. These folks service the RV towing industry & this is their most popular tank. On my trip, I was towing my 25' travel trailer at all time. Whild going thru MI., I filled-up in St Ignace, which, is the first town you hit on the north side of the Mackinaw Bridge between the upper & lower penninsula's of MI. I zig-zagged across the UP of MI & drove all the way back to Guymon, OK. in far northwestern OK.

At the time, OK. was known to have some of the cheapest fuel in the country. That trip was 1,535 miles with no fuel stops & I still had about 1/2 left in the main tank. I could have made it into NM. but, wanted to take advantage of the better fuel pricing in OK.

I like my aux. tank. The cost of the tank would buy a lot of fuel, I understand but, I like the convenience. Also, there is a lot of weight you are hauling around all the time. Still, I like the convenience.

Joe F.

 

Diesel is also heavy, so that extra 90 gallons on board all the time means you're reducing your load carrying capacity by 650 lbs and also your mpg.

 

I got a 37gal from Northern Tool along with the gravity feed kit. When running empty, I usually refill at 1200 miles or so with 1/2 left in the main tank.

Took a long trip this summer to Alaska. On the Dalton Hwy, it was great to go up and back without having to refuel. Not to mention passing stations in Yukon/BC where I saw fuel at $1.89/L (that's over $7/gal!).

 

That's an "extra" 50 gallons. And, yep, does reduce your capacity. I also noted the following on several trips. When towing, I average 12.7 using the aux tank. Without the aux tank I average 12.7. Hmmmm???? LOL Seriously, I can't notice any difference between full or empty, only the convenience of buying where and when I want for the best price and not worrying about it when hitting areas like the Alaska highway.