Is it possible to add an auxiliary fuel tank behind cab？

I was told once that some states don't refund over payment until it's more than a certain amount. I don't know if that's real or not, as I've never had to deal with ifta.

My other thought was paying in the high tax states should mean you've covered overall and won't have to pay in.

 

IFTA is a net tax. If you over paid here, and underpaid there, the states will settle up themselves based on your report. You will owe if net you underpaid, you will get a refund if you overpaid.

 

No need to reinvent the wheel. Go buy a used 80 gal frame mount wet line tank. Use it for diesel and no one will ever question it. Plumb it to a splitter with a ball valve and turn it on when your tanks are below half. After a little practice it'll become second nature.

 

Thanks . but it would be too wide for me. because it might cause the trailer hit the tank while turning. I measured the space for 3rd tank that must be within 21 inches.

 

21`` deep or wide? it can be an issue. On my truck i had issues with a deep kingpin trailers when I had my wetline tank behind the bunk. My tank was the same width as the frame and around 14" deep. It was flush with the rear of the cab extensions.

 

21 inches deep .thanks

 

I used to drive a 1995 Peterbilt that had 3 tanks from the factory. 2 tanks each held 150 gallons, the 3rd tank held 100... Total fuel capacity of 400 gallons. All three were tied together. Drivers side had one 150 tank behind the steps under sleeper. Passenger side had the 100 under the door with steps on the tank. The 2nd 150 was behind the 100 under the sleeper.

 

I'm thinking of adding a 3rd tank as well. I have the room on the frame. Just not sure how to plumb it to make it easy. I'll probably just use a pump to transfer it to the main tank. Not trying to get around ifta related issues. Just do oversized loads with poor mpg, and great difficulty getting into fuel stops. Dropping the trailer isn't always easy due to the size and how hard the ground is under the trailer. Sometimes we get to the delivery and the cranes won't unload due to wind or possible lightning, so arriving with extra fuel is a good thing as we might be camping. Any suggestions on how to plumb the tank to make it easy. Truck has 2 150 tanks gonna add 100

 

i would just plum it in to the same lines as the tank on that side. "T" fitting on the feed and return lines. That way all 3 tanks will balance out. I would also add shutoff values on the 3rd tank so you only use it when you need it

 

Kind of what I was thinking, just not sure if there was some kind of science to all of that with the tanks being top draw, no underneath crossover. Might add shut offs to the original tank as well I could keep weight off the steering axle that way. My original tanks are under the doors. I plan to add a fuel guage to the 3rd tank as well, so I know what is going on back there. Thanks for your reply. I guess I'm just overthinking it.