Skip the auto shop - Our mechanics make house calls

Q: What Is Fuel Injection?

asked by on

What is fuel injection?

A: Fuel injection is a means of adding fuel to...

Fuel injection is a means of adding fuel to the incoming air of an engine.

Previously, fuel was added to the incoming air inside a carburetor. Air passing through the venturis of the carburetor would siphon fuel from the fuel bowl of the carburetor so that the fuel would mix with the air inside of the intake manifold. This air and fuel mixing inside the intake manifold is what is called a "wet" intake.

Fuel injection sprays fuel on the back side of the intake valves, just before the air enters the combustion chambers. The fuel mixes with the air inside the cylinders instead of the intake manifold. This is what we call a "dry" intake.

There are two basic types of fuel injection: mechanical and electronic.

Mechanical fuel injection was tried by General Motors back in the 1950s and 1960s on some of their Corvette engines. You can still find mechanical fuel injection systems being used by drag racers at the race track.

Electronic fuel injection has been in use on every vehicle for over 30 years, now. Solenoids, which we use as fuel injectors, are used to control fuel flow to the cylinders. The fuel injectors are, in turn, controlled by a computer. A variety of electronic inputs are fed to the computer to control when to open the fuel injectors and for how long.

Fuel injection, especially electronic fuel injection, was the necessary evolution of fuel control as a result of the U.S. Government’s issuance of CAFE standards (Corporate Average Fuel Economy) dating back to 1975.

If you run into any problems with your fuel injector, have a certified technician replace or flush out the system if necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why doesn't car start after running out of gas girlfriend ran gas out of car now won't start plenty of gas in tank doesn't sound l

Fuel pumps rely on liquid gasoline for cooling. Consequently, it is recommended to keep the fuel tank at least 1/4 full to prevent the fuel pump from overheating. If the pump is run to the point of being dry, the...

Q: Took it to a mechanic, nothing found through scanner

I would recommend going to the mechanic you trust and have them do an inspection to make sure the fuel filter and lines are not leaking. Sometimes an aftermarket fuel filter can leak at the connections and may need to...

Q: I was told it would get about 26 highway miles up to 30 I am getting 22 miles to a gallon and other lyrics 226 miles per tank of g

After a quick search, the 2016 Jeep Compass with 2 liter engine is rated at about 22 miles per gallon in the city and 26 on the highway. This number is a general calculation and really depends on how the...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.