Topic: Auxiliary fuel transfer tank

[oHIobellboy]

Very cool.

This will have to go on my list of mods "to do some day".

You gonna be able to pull that off on a 2500? They've already got a second tank.

[Richie_Rich]

You gonna be able to pull that off on a 2500? They've already got a second tank.

I don't appear to have a second tank, unless it's some double type deal with only one filler pipe.
I thought it was just one big tank.

[oHIobellboy]

I don't appear to have a second tank, unless it's some double type deal with only one filler pipe.
I thought it was just one big tank.

There is an Aux tank above your spare that feeds down into the main tank as needed I believe. I know I've read post about that before. It does all fill with ony the one filler tube.

[HenryJ]

There is an Aux tank above your spare that feeds down into the main tank as needed I believe. I know I've read post about that before. It does all fill with only the one filler tube.

He is right. This was the first that I had heard of it but there is indeed a factory dual tank. I don't find an RPO code, so it must be standard equipment for the 2500?

It does look like the install might be somewhat "involved", but something I would have looked into further had I known. I wonder what size it is? It would probably be listed in the 2500 owners manual. A quick check in the Linked manuals here shows only 6.5 gallons capacity difference. Hmmm...
I think I'll be happier with an additional 18.1 gallons 

[Richie_Rich]

My tank is 37.5 gal.
I get just under 12 mpg normally and only about 8 towing.
Another 18 gal or so would be nice.

[HenryJ]

My tank is 37.5 gal.
I get just under 12 mpg normally and only about 8 towing.
Another 18 gal or so would be nice.

Looking through the repair manual, I would say that you already have dual tanks on the 2500. The 37 gallon capacity comes from the 31 gallon side tank and a small rear tank mounted above the spare tire and behind the axle. The two total just over 37 gallons.
It would likely be quite involved to add the 18 gallon tank to the 2500 as you would be removing the rear tank and need a single tank fill tube? The evaporative emissions canister may also have been relocated. That too might need to be moved?
It might be easier than I think. It will not be quite as easy and the install I am doing on the 1500 though.
I could be totally wrong though. The 2500 has everything in place and just needs a larger replacement tank. If you are willing to relocate the spare there may be lots of options.
I had considered one of the Streetrod Poly tanks
I think it is just a matter of finding what will work for a fill location and correct width. The 1500 has 36.5" between the rails and 27" length leaves room for crossmembers. The trick is finding a nice thin tank that works.

Rockauto.com lists the tank that I used fitting applications clear back to 1973. Tank Dimensions: 34 3/4" x 27" x 8 is shown to be a 19 gallon tank. It looks like I could use a different replacement tank that measures 34 3/4" x 27" x 13 3/4". The only difference appears to be the lower straps and bottom half of the tank. I do not see the tanks straps listed though. That is a 38 gallon tank. It looks like it would be a direct bolt in to the one that I have now. 5 3/4" lower would mean there would not be room for the spare under there anymore. Can you imagine? That would put the range out there at 900 miles. Nice to have that option available for a truly long ranger.

I picked up a LED indicator lamp and momentary push button switch today. The color coding for the factory pump and sender has been decoded. The gauge should arrive tomorrow and I'll complete the install.

[Alaska_AV]

hmmmm

I might be adding a 2inch body lift to my 2500.   maybe I'll give this a look if I take the body off

[HenryJ]

Parts finally arrived today.

The fuel gauge is in-



All wired up and ready for fuel. The gauge is a little lower than I might have preferred. The fuel button is in a nice place though. I may have to work a little to check the fuel level. Tomorrow I think that I'll heat the panel and tip it up a little bit.
I'll fill the tank and check the gauge calibration too.

[Main One]

 

[HenryJ]

I did heat up the knee bolster and push the top in more as well as adding a wedge around the bottom side to angle it upward a bit more.



The gallons display is now visible from my driving position.  Still need to fill up. I'll do that on my next trip to town.