Fuel Systems

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 C8H15

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– O2 oxygen

– H2O water

– CO2 carbon dioxide

– C8H15 hydrocarbons– CO carbon monoxide– Nox oxides of nitrogen

Have a nice day!