Car Components Fuel Systems 

Cleaning fuel-pump filters

The most common type of pump; if there is a sealing ring, check it. A blocked fuel-pump filter will cause the engine to cut out intermittently, particularly at high speeds, and it may stop altogether. Not all cars have a filter in the pump. Later models often have sealed, filterless pumps which do not need maintenance, and rely on filters elsewhere, mainly in fuel pipes or the petrol tank, or at the inlet to the carburettor float chamber. Many cars have a mechanical fuel pump driven off the camshaft. The…

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Car Components Fuel Systems 

Checking fuel pipes

A single fuel pipe runs from the tank, under the floor of the car to a mechanical pump on the engine. The pump delivers fuel to the carburettor. Whenever you check fuel pipes, disconnect the battery to prevent stray sparks igniting petrol or petrol vapour. Above all, put out all naked lights and cigarettes. Use a torch rather than an inspection lamp, which could start a fire if the bulb is accidentally broken. The fuel pipe of a car with the engine in front and the fuel tank at the…

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a-mechanical-fuel-pump Car Components Fuel Systems 

How to Check a mechanical fuel pump

If a car stops and has not run out of petrol, check whether there is petrol in the carburettor. If there is not, there is a fault in the fuel system. Disconnect the fuel line to the carburettor, slipping a plastic bag over the end of the line as you do so to catch any fuel inside. Secure the bag with a rubber band, then turn the engine over with the starter. An electric motor which uses a geardrive to crank (start) the engine. If the fuel is ejected, there…

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