By Kirk I Inkster
Although fuel injection has been around for many years, the advent of electronic fuel injection with the wonders of all the little computerized modules in our automobiles finally brought the era of the automobile carburetor to its virtual end of the road.
It can be said that fuel injections advantages over the older carburetor fuel injection systems that were the mainstay years ago in most gasoline powered vehicles on the roads and highways of the USA & Canada. The advantages of fuel injection powered systems over carburetor ones include easier cold starting – is a godsend of reliability in northern states of the USA and up north in Canada. Add better performance, more precise control over fuel mixtures resulting in better and more economical fuel economy and as a final touch reduced emissions. Fuel injection systems also eliminate the need for automotive components such as the choke, accelerator pump and idle stop solenoid. With so much in its favor its not surprising that fuel injection fuel systems have taken over the road when it comes to fuel systems in new cars and trucks on the road today.
The main difference between a carburetor and fuel injection is that the fuel is drawn into the engine by vacuum in a carburetor system whereas with fuel injection it is sprayed or injected into the engine under pressure. When air passes down the narrow part of a carburetors throat (called the venture), it creates a difference in pressure between the air in the venture and in the carburetor fuel bowl. The difference in pressure draws the fuel through the carburetors main jets and metering passages and into the venture where it mixes with air and passes into the intake manifold of the gasoline engine.
With fuel injection, fuel metering is not dependent on differences in air pressure. Fuel is sprayed into the incoming air stream, creating a much finer mist that promotes better fuel atomization and mixing. The amount of fuel that is injected depends only on the volume of the air entering the engine and engine load and loads. This is where the electronic part and parts come in because basically it took until the advent of small portable electronic components -essentially a computer and computerization. Various electronic engine sensors to calculate how much fuel is needed to maintain the correct fuel / oil mixture.
Lastly in order to function properly all of the engine sensors must be working and feeding correct information to the computer. If as a driver you note the check engine light appear- it may well be that the system has determined that one of the sensors in not working properly and must be attended by properly trained and certified technicians.
Sadly in this day and age often its a tactic or easy fix simply to check the codes and in effect turn the alerts off. As a motorist you might think that everything is fine in your vehicle. However it may simply be the case that your codes have been reset the alert system has been turned mute and your fuel injection system sensors need checking, testing and perhaps replacement.
About the Author: Kirk I Inkster 50 Years Experience in the Edmonton Northern Alberta Oil Sands Canadian Automobile Industry
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