Ram Trucks 2012 3500 - Owner Manual - Manual (Page 538)

CAUTION!
Replacing fuel system components with non-ethanol
compatible components can damage your vehicle.
Maintenance
CAUTION!
Do not use ethanol mixture greater than 85% in your
vehicle. It will cause difficulty in cold starting and
may affect driveability.
ADDING FUEL
The fuel filler cap (gas cap) is located behind the fuel
filler door, on the left side of the vehicle. Open the fuel
door and remove the fuel cap by turning it counter-
clockwise.
NOTE: When removing the fuel filler cap, lay the cap
tether in the hook, located on the fuel filler door.
Fuel Filler Cap
536 STARTING AND OPERATING