Hyundai 1 inch Owner's Manual page 18

Ensure that the assembly of the air filter is correct. Never run the water pump
without the air filter or with a damaged air filter.
5) Check the Fuel
Before each operation of the water pump, check the fuel level with the water
pump placed on a level ground. Screw off the fuel tank cap and check the fuel
level. If the level is too low, add fuel, screw on the fuel tank cap and tighten it.
ONLY USE STRAIGHT UNLEADED PETROL.
Do not add fuel over the fuel strainer shoulder (maximum level)
Refuel in a well ventilated area. Ensure the engine has had time to cool down
before refuelling.
Fuel can damage paint and plastic. Be careful not to spill fuel when filling
your fuel tank.
6) Fuel Recommendations
Use straight unleaded petrol.
Never use stale or contaminated petrol or a mixture of oil and petrol and avoid
getting dirt or water in the fuel tank.
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