TVS Apache RTR 160 4V Owner's Manual page 51

EVAPORATIVE EMISSION CONTROL SYSTEM
This vehicle is fitted with Evaporative Emission
Control System (EVAP).
1
Caution
Never fill fuel beyond the fuel tank inlet (1). Filling
above the inlet may result in improper breathing of
fuel tank which leads to difficulty in starting as well as
improper running of the vehicle.
Whenever refueling the bike fill only the recommended
quantity of fuel (10 liter including reserve).
Do not clean the vehicle by laying down on floor, to avoid
fuel entry into EVAP system.
48
If there is any abnormal jerk, startability issue are felt
in the vehicle or noise due to sudden escape of gas
during opening of fuel tank cap, immediately report
to the TVS Motor Company Authorised Main Dealer /
Authorised Dealer.