Fuel Systems

Purpose of the fuel system –Store fuel –Deliver fuel –Pump fuel –Filter fuel –Mix air and fuel –Meter air and fuel

Fuel Systems Parts of the fuel system: –Tank cap –Tank –Lines –Filter –Pump –Carburetor

Fuel Systems Types of fuel –Gasoline –Kerosene –Diesel –LP- Liquefied Petroleum-Propane –Natural Gas –Alcohol Gasoline –Hydrocarbon compounds –Hydrogen and carbon molecules C 8 H 15

Fuel Systems Gasoline additives –Anti-icing or Deicer –Metal deactivators and Rust inhibitors –Detergents –Ethanol 10% max.(grain) –Methonal 5% max.(wood) –MTBE (methyl tertiary butyl ether) 11% max. Reformulated or oxygenated gas

Fuel Systems Volatility –The ease at which a liquid can vaporize Volatility changes –High volatility for cold temperature –Low volatility for hot temperatures

Fuel Systems Combustion –The burning of air and fuel

Fuel Systems Detonation –A second burning of the fuel after the spark occurs which causes the engine to knock

Fuel Systems Preignition –Ignition of the air-fuel mix before the spark

Fuel Systems Knock, a noise caused by preignition or detonation Octane –The ability of a fuel to resist knocking –Isooctane and heptane as base line –RON + MON / 2

Fuel Systems Stoichiometric –Chemically correct air fuel mixture –14.7 parts of air to 1 part of fuel Rich mixture –Air-fuel mix with more fuel than required Lean mixture –Air-fuel mixture with less fuel than required

Fuel Systems Byproduct of combustion –O 2 oxygen –H 2 O water –CO 2 carbon dioxide –C 8 H 15 hydrocarbons –CO carbon monoxide –No x oxides of nitrogen

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