Servicing the fuel supply system

Servicing the fuel supply system

Here you can get Servicing the fuel supply system and fuel system working principle. The fuel supply system is typically dependable and any issues that do arise are normally traceable to the pump , the gasoline filter or the tank. Occasionally, however, the fault lies in the gasoline line among the tank and the engine.

Pipes can suffer from main faults: leaking or blockage. Probably the first indication you will get of a leak is the smell of petrol wafting into the car – do not put off in locating the problem, because the petrol vapour may be ignited easily.

Blocked pipes are usually very obvious – the car comes to a halt or suffers from fuel starvation. Thankfully this is now rare because fuel filters are fitted to remove dirt.

Types of pipe

The fuel line normally includes inflexible metallic pipes, with flexible rubber or plastic hoses running from the pipes to the tank and the fuel pump, and from the pump to the carburettor. The flexibility of the hoses allows some movement between these different components. On a few motors the inflexible pipes are made of reinforced plastic rather than metal.


A fault in the pipes and hoses, or in their connections, is a potential fire hazard, so you have to check the system every year. Disconnect the battery as a safety recaution against any possible sparks. Jack up the car and assist it on axle stands. Carefully inspect the pipe along its whole length. Look especially carefully at the joints, checking for dark stains that indicate a leak. Use a spanner to test that every one union pipe connections are tight. Also check every steel pipe for rust – use a wire brush to take away any surface rust at the pipes. If the pipe is wrongly pitted below it have to be replaced.

Inspect the flexible hose and connections too. Bend and twist them, looking for any splits. If the pipe has come to be hardened because of antique age or is tender due to oil contamination, it have to be replaced. Flexible pipes use several types of securing clip; make sure they are tight and not corroded. Check the routing of the pipes, they should not run too near warm engine parts such as the exhaust pipe or manifold. Check the pipe is secure in its clips and isn’t chafing on anything.

If you found a pipe or hose that is badly damaged it will need replacing. Before you start work, drain the gasoline from the tank into a suitable container and store it safely.


Many fuel pipe problems are caused by the filters becoming blocked. There are different types of filter of which one of the most common is the plastic in-line type. Check along the fuel pipes until you see the filter, which is usually barrel shaped. It is often transparent and you can see if it is blocked.

Servicing an in-line fuel filter

an in-line fuel filter

An inline fuel filter

The disposable in-line fuel filter is usually fitted under the bonnet in the gasoline pipes among the gasoline pump and carburettor. Some fashions are obvious so you can see whilst they have emerge as blocked. If in any doubt about the condition of the filter, change it. New ones are cheap to buy.

First release the fixings holding the filter to the fuel pipes. Some designs use Jubilee clips even as others have union nuts. Remove the clear out out then fit the new one in place. Make sure the arrow is pointing in the direction of fuel flow.

Servicing a glass-bowl filter

The other type of fuel filter you may find is generally in the engine bay, and includes a filter element mounted inside a glass bowl. The bowl hangs down from a steel mounting this is secured in the inner wing through bolts or screws. Before you start, discover out of your provider if the filter element is disposable or if it may be cleaned. If it is disposable, get a new one.

Place a box under the clear out out bowl to trap petrol, then undo the knurled nut under the glass bowl. Lower the bowl off and pour out the petrol. If it is stuck, gently jar it loose together along with your palm. Remove the clear out out element and both discard it or clean it with petrol and a smooth paint brush. Clean out the filter bowl and replace the filter— make sure the knurled nut is tight.

Fuel Systems

Internal combustion engines require fuel in order to run and motor vehicles are thus equipped with a fuel system that keeps the engine supplied with the correct amount of fuel, for all operating circumstances.
The function of the fuel system is to store and supply fuel to the cylinder chamber where it can be mixed with air, vaporized, and burned to produce energy. The fuel, which can be either gasoline or diesel is stored in a fuel tank. A fuel pump draws the fuel from the tank through fuel lines and delivers it through a fuel filter to either a carburetor or fuel injector, then delivered to the cylinder chamber for combustion.

Components of Fuel System

The main components of the fuel system consist of fuel tank, pump, filter and injector/carburetor.

Fuel Tank: It acts because the reservoir for the vehicle’s fuel. The tank has an electronic “trigger” that conveys statistics regarding the quantity of gasoline to the fueloline gauge.

Fuel Pump: Its number one feature is to draw fuel from the gasoline tank and pump it into the inner combustion engine. There are sorts of fuel pumps: mechanical and electric, which are utilized in motors with carburetors and electronic gasoline injectors, respectively.

Fuel Filter: It is constant in both the ends of the gasoline pumps to split impurities from the gasoline, thereby ensuring most beneficial engine performance.

Fuel Injector: It is an electronic valve that opens/closes at normal periods to supply the proper quantity of gasoline to the engine.

Carburetor: Its principal cause is to combine the proper quantity of air and gasoline and supply it to the engine. The carburetor is the predecessor of the gasoline injector.

Working Principle

Some of this may seem a little silly, as many components are pretty obvious to all of us. Fundamentally, once you fill the tank with gas the device is “ready.” When you begin the automobile the gasoline pump begins the method of drawing gasoline from the gasoline tank, thru the gasoline strains and gasoline clear out out, to the device that controls gasoline/air shipping to the engine (a carburetor or gasoline injector). While the automobile is going for walks a non-stop deliver of gasoline is added on this fashion.

The fuel system in current automobiles is a complicated and intricate combination of components and electronics. Generally, Fuel systems work in the
following ways:

• Fuel is delivered from the gasoline tank to the fuel injectors thru a gasoline pump and fuel lines. The pump is typically placed near the gasoline tank or inside the tank itself.
• Fuel leaving the gasoline tank and gasoline pump passes thru a gasoline clear out out which purifies and receives rid of any containment. This is typically a excessive capability inline design, to maximize go with the drift prices.
• Fuel travels alongside the fuel lines and is delivered to the fuel injectors. Fuel Injector pressures are controlled thru a pressure regulator.
• Any gasoline which isn’t used and exceeds pressure rates is returned via fuel strains back into the fuel tank.


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