Bigger or dual fuel tanks...

[dimitrisnowden]

Are their any notable downsides to mounting an additional 81gal tank (on a M925A2) to extend the trucks fuel range? Is the work straight forward?

 

[doghead]

How do you plan to use the truck?

Your profile picture is an M925 (w/w). Is that the tuck you're considering this modification for?

 

[dimitrisnowden]

Ah yes! fat fingered I'll correct in the post. Cross country travel, pulling my race cars.

 

[Triple C]

Most Class 8 trucks use dual tanks with a crossover line between them to help keep them equalized. Fuel to the engine is pulled from the closest tank. Just make sure they are level with one another and you might want to install a second fuel gauge. I would think it would be pretty straight forward if you have good mounting points.

 

[gimpyrobb]

Why not add a tank in the bed?

 

[doghead]

Do you plan to keep and use the winch?

The hydraulic tank is probably going to be in your way.

You know they will go about 300 miles or more on a tank, right?

Do you have your truck now?

 

[turnkey]

Go dual, works best for range and easy of operation.

 

[Csm Davis]

Would add a second tank in place of the toolbox and use the dual tank plumbing of the tractor or wrecker, the gage can be setup the same.

 

[dimitrisnowden]

wow great feedback guys, thanks! so a few questions:

1. should i make tank #2 on a toggle switch where i can select wether to draw from tank #2 or not?
2. does a typical dual tank set up mimic #1 or doe the engine draw for both at the same time, thus recalibrating the fuel gauge in ratio to 162 gallons opposed to 81 gallons? <-- is that even possible?
3. should i use one gauge recalibrate (if possible) or a standalone gauge for tank #2?

 

[Triple C]

Lots of ways to do it. If possible I would mount them same height and run a good crossover tube at the bottom so they stay equalized. Then your gauge stays accurate with no modifications.

 

[Aussie Bloke]

G'day everyone,....


Just run a connecting line between the tanks as the fuel will self level, also run a breather line between the 2 tanks so as fuel transfers itself over air can move out.
No need to do anything about the fuel gauge if set up this way.



Aussie.

 

[74M35A2]

Ford used an all-in-one tank selector valve which also switched the sending unit wire accordingly. They used it for carbureted, injected, and diesel engines, all the same valve I believe. It was made by Pollak. I used one to make my own stand alone dual fuel tank for a flatbed tow truck which used a fuel injected gasoline engine. It worked fine. They don't last forever, but should get at least 10 years out of it. It switches the return line accordingly also, so you are always returning to the tank in use. This would allow you to better control the fuel level in each tank, if that was a desire at all, vs the above referenced under-frame cross-over tube OTR trucks utilize.

http://products.pollakaftermarket.com/category/fuel-selector-valves

I think the valve goes for about $100. You use a standard 2 position, 6 terminal switch to activate it. Easy. May be available in 24V, I have never checked.

 

[jspanier]

I just finished having the end caps cut off and have made two tanks into one large one. I also added some straight thread weld ports to tie an addition cross over tank to the setup. Should put my fuel capacity around 200 gallons with the cross over.

 

[Another Ahab]

I just finished having the end caps cut off and have made two tanks into one large one. I also added some straight thread weld ports to tie an addition cross over tank to the setup. Should put my fuel capacity around 200 gallons with the cross over.

 

[jspanier]

bigger/longer. I added ports to add a dual as well but haven't attempted in yet.

 

[Another Ahab]

I just finished having the end caps cut off and have made two tanks into one large one. I also added some straight thread weld ports to tie an addition cross over tank to the setup. Should put my fuel capacity around 200 gallons with the cross over.

View attachment 544231

 

[4x4 Forever]

You trying to say something Ahab??

 

[Another Ahab]

I just finished having the end caps cut off and have made two tanks into one large one. I also added some straight thread weld ports to tie an addition cross over tank to the setup. Should put my fuel capacity around 200 gallons with the cross over.

View attachment 544231

View attachment 544235

You trying to say something Ahab??

 

[4x4 Forever]

I still don't get it...

 

[Another Ahab]

I still don't get it..