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Wednesday, September 3, 2014

Symptoms of Failure of Carburetor and How to Replace It

Electric fuel pump
Get to know the carburetor
The carburetor was a key component in the older makes of cars. The main function of the carburetor are:
  •  Makes fuel and air create a highly combustible mixture.
  •  Regulates the ratio of air and fuel mixture.
  •  Controls the engine's speed.
Where does carburetor located
The carburetor is located near the fuel tank and the engine. After the air-fuel mixture is created it sends to the intake manifold of engine. The air and fuel is sucked from the atmosphere and the fuel tank.

Symptoms of failure of carburetor
  • Hard vehicle starting
    • The carburetor plays a vital role in starting the engine of the vehicle.
    • The vehicle ignition system is dependent upon sufficient amounts of air-fuel mixture passing into the combustion chambers.
    •  If the carburetor is in bad condition, it limits the flow of either fuel or air into the engine.
    • The vehicle will hesitate to start and the carburetor houses a choke mechanism that temporarily provides the air/fuel mixture to run the vehicle initially.
    • If the carburetor choke mechanism is also not working properly, the engine doesn't start.
  • Engine missing
    • Another common symptom of a bad condition carburetor is an engine that runs unevenly
    • An jerking of engine normally occurs as the result of awkward fuel supply into the engine and results in incomplete engine combustion and inefficient engine performance
    • Sometimes, a bad condition carburetor reduces the flow of fuel into the engine and causes a engine mishap.
    • An engine mishap can be caused at both idle speed and also under normal acceleration.
  • Black exhaust smoke
    • Another common symptom of bad condition of carburetor is, the carburetor will often emit black smoke from its exhaust.
    •  Even through black smoke which in symptom of severe other cases can be quite enormous.
    • This is due to a improper air/fuel mixture in the carburetor.
    •  If air-fuel mixture is incorrect, many problems can occur, which includes poor engine performance, poor mileage, and also the emission of black exhaust smoke.
How to replace a carburetor
  • First, make sure that the engine is in switched off state.
  • Remove the hoses and fuel lines from the carburetor
  • Remove the nuts that hold the carburetor to the intake manifold.
  • Take the carburetor off.
  • Now clean the surrounding area of the carburetor with the air blower or the vacuum cleaner.
  • Scrape all dirt and gasket material around the carburetor. Make sure that the carburetor sucking air because of an imperfect seal.
  • If air is leaking replace a new gasket. The gasket should have coating of gasket sealer on both sides.
  • Fix the new carburetor, after fixing the new carburetor , tighten the carburetor onto the intake manifold by tightening the nuts.
  • Connect all the fuel lines and remove all tools from the top of the engine.
  • Fill the carburetor with small amount of air-fuel mixture and Start the engine.
  • Check for any vacuum leaks and then check for gas leaks on fittings.
  • Tighten them to prevent any leaks. If they continues to leak replace the gaskets.
  • Reconnect the air cleaner on and close the hood.

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