Fuel Tank capacity??

Dealer can tell from the vin# what tanks were put on the truck when it was built......

I've never seen a 35gal tank on a truck it has to be at least a 55 gal....

 

Or you could take a tape measure and get the length and diameter of the tank. If it's been a while since the 9th grade, Google volume of a cylinder. Rember, radius is half the diameter. Plug length and radius in the online calculator, it will give u vol in cubic inches. Now, multipy that number times .004329 to get us gallon .

 

There you go.

 

Run it until its almost empty and then note how much fuel you put into it?
My Volvo has 2 x 150
When the mechanical gauge reads near empty, and the electronic gauge says I have like 20 gallons left, I typically put 220 gallons in it, and the electronic gauge will say I have 284 gallons. The mechanical reads full, but only briefly, and no its not running out on the highway. I think the most accurate is the electronic that tells me fuel used. I'm sure there is 30 or 40 gallons rolling around in there when it reads empty, I've looked and can see several inches of fuel above the pick-ups, but when the electronic says empty, the mechanical says empty, the fuel warning light is on, its hard to continue on. Cause if I were to run out, I'd have a hard time coping with being that stupid.

 

Mine has a 150gl on the passenger side, 75 on the drivers.

 

Google tank capacity calculator. Enter your dimensions and walla. I had one saved on my phone. Gallons by the 1/4" handy when the gauge is off or quits working while on the road.

 

3.14 and all that lol

 

This is full tanks minus 10 gallons
( 280 ) gallons. 280 is max. That's fuel used.
That's the MPG, farking 200 mile wind storm took a bite. 78,600 gross.

See there is 50 or so gallons between tanks that just kinda always stays in there. I put in 215 at the pump.