hi everyone, first time posting - first time owning gmc.

last week got a smoking deal on a '04 3500 ext. cab, 8.1l dually, with service body on the back. i will be using it for my mobile welding rig.

the truck has two gastanks - but i'm not seeing a switch or button to "switch" tanks in the cab.
is there one? does it switch automatically? please reply

thanks

 

the tanks drop evenly...a transfer pump keeps em at the same levels.

 

Thats petty cool! I heard gas is $0.40 a gallon in Iraq I wonder if I could get a few drums sent here if it would be cheaper than buying it here.

 

what's cool?