Hyundai PT3900-JY Instruction Manual page 45

Never use stale or contaminated gasoline or oil/gasoline mixture. Avoid getting dirt or water in the
fuel tank.
Occasionally you may hear light "spark knock" or "pinging" (metallic rapping noise) while operating
under heavy loads. This is no cause for concern.
If spark knock or pinging occurs at a steady engine speed, under normal load, change brands of
gasoline. If spark knock or pinging persists, see an authorized generator dealer.
NOTICE
Running the engine with persistent spark knock or pinging can cause engine damage.
Running the engine with persistent spark knock or pinging is misuse, and the Distributor's Limited
Warranty does not cover parts damaged by misuse.
Oxygenated Fuels
Some gasoline are blended with alcohol or an ether compound to increase the octane. These
gasoline are collectively referred to as oxygenated fuels. Some areas of the United States use
oxygenated fuels to help meet clean air standards. If you use an oxygenated fuel, be sure its pump
octane rating is 86 or higher.
Ethanol (ethyl or grain alcohol)
Gasoline containing more than 10% ethanol by volume may cause starting or performance
problems. Gasoline containing ethanol may be marketed under the name "Gasohol".
Methanol (methyl or wood alcohol)
Gasoline containing methanol must contain cosolvents and corrosion inhibitors to protect the fuel
system. Gasoline containing more than 5% methanol by volume may cause starting and/or
performance problems and may damage metal, rubber and plastic parts of your fuel system.
MTBE (methyl tertiary butyl ether)
You may use gasoline containing up to 15% MTBE by volume. Before using an oxygenated fuel,
try to confirm the fuel's contents. Some states (provinces in Canada) require this information to be
posted on the pump. If you notice any undesirable operating symptoms, switch to a conventional
unleaded gasoline. Fuel system damage or performance problems resulting from the use of an
oxygenated fuel are not ours responsibility and are not covered under warranty.
NOTICE
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