Honda Civic Service Manual: Internal Combustion Powertrain Control

Valve Inspection (R18A9)

1. Fuel Pressure - Relieving (Between the engine and the manual shut-off valve) (Natural Gas Model) Compressed natural gas is flammable ...

Engine Control

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See also:

Honda Civic Owners Manual. Fuel Information
Fuel recommendation Unleaded gasoline, pump octane number 87 or higher Use of a lower octane gasoline can cause a persistent, heavy metallic knocking noise that can lead to engine damage. Top tier detergent gasoline Because the level of detergency and additives in gasoline vary in the market, ...