Cadillac 2015 ATS Owner's Manual page 236

When replacing the fuel cap, turn it
clockwise until it clicks once. Make
sure the cap is fully installed. The
diagnostic system can determine if
the fuel cap has been left off or
improperly installed. This would
allow fuel to evaporate into the
atmosphere. See Malfunction
Indicator Lamp on page 5-14.
Caution
If a new fuel cap is needed, be
sure to get the right type of cap
from your dealer. The wrong type
of fuel cap may not fit properly,
may cause the malfunction
indicator lamp to light, and could
damage the fuel tank and
emissions system. See
Malfunction Indicator Lamp on
page 5-14.
Coupé Capless Fuel System
The coupé vehicle has a capless
refuelling system and does not have
a fuel cap. The filling nozzle must
be fully inserted and latched prior to
starting fuel flow.
Driving and Operating
Filling the Tank with a Portable
Fuel Can (Coupé)
If a coupé vehicle runs out of fuel
and must be filled from a portable
fuel can:
1. Locate the capless funnel
adapter from under the carpet in
the boot.
2. Insert and latch the funnel into
the capless fuel system.
Warning
Attempting to refuel without using
the funnel adapter may cause fuel
spillage and damage the capless
fuel system. This could cause a
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