The Anatomy of an Explainer: Breaking Down How Fuel Injection Pumps Work
Curious how your car really works?
Learn how fuel injection pumps work so you can keep your engine running strong!
It’s no secret your engine runs on precision…
Diesel engines are finely-tuned machines that require high-quality fuel to run properly. And without fuel injection pumps working correctly, your engine would not get that fuel where it needs to go.
…but what you might NOT know is how it actually happens!
Unless you’re a mechanic or gear head yourself, you probably don’t know how fuel injection pumps work.
And that can cost you thousands in unnecessary repairs and wasted fuel.
Fortunately, learning the basics of fuel injection pumps is easier than you might think. Here’s what we’ll cover:
- What Is a Fuel Injection Pump?
- How Fuel Injection Pumps Work
- Types of Fuel Injection Pumps
- Symptoms of Fuel Injection Pump Problems
- Why Quality Matters for Fuel Pump Sales
What Is a Fuel Injection Pump?
A fuel injection pump delivers fuel to the engine.
More specifically, it pressurizes fuel then injects it into each cylinder at just the right moment. It must provide precise fuel metering to keep your engine running smoothly.
You can think of a fuel injection pump as the conductor of an orchestra.
Each instrument needs to play at the right time or else the song doesn’t sound right.
Fuel injection pumps are no different.
When you’re looking to buy quality fuel injection pumps online, you want to do your research beforehand. Not all fuel injection pumps are created equal. They have to be strong enough to withstand massive amounts of pressure while maintaining precise metering.
Due to improvements in engine technology, fuel injection pump sales have skyrocketed over the last couple decades. Modern fuel injection pumps can improve your fuel economy by up to 30% compared to older style carburetors.
Before we talk about how much of a difference these pumps can make. Let’s dive into how they work.
How Fuel Injection Pumps Work
Fuel injection pumps operate in three simple steps.
Step 1: Drawing Fuel
Fuel enters the pump from the tank through fuel filters. These filters remove dirt and debris that could clog or damage the injection pump.
Clean fuel is critical to the life of your injection pump. Imagine what dirty fuel could do to your engine.
Fuel injection systems create more than 2,000 bar of pressure. (That’s over 29,000 psi!)
Step 2: Increasing Fuel Pressure
Now it’s time to pump up that fuel!
Fuel injection pumps increase the fuel pressure to prepare for injection into the engine. Common rail systems used in newer diesel engines can create upwards of 30,000 PSI.
Increasing fuel pressure allows for the fuel to be atomized into very small particles.
These small particles allow the fuel to combust more completely which translates to more power and less harmful emissions.
Step 3: Fuel Injection
Last but not least, the high-pressure fuel is delivered into the engine.
Modern fuel injection systems deliver fuel into each cylinder at exactly the right time. If fuel is injected too early or too late, it can cause your engine to knock or lose power.
In the past, mechanical systems were used to time fuel injection. Today, nearly all injection pumps are controlled by electronic systems. This allows for much more precise fuel delivery than ever before.
Types of Fuel Injection Pumps
Although there are several different types of fuel injection pumps, they all operate using the same basic principles.
Let’s take a look at the three most common types of fuel injection pumps.
Inline Fuel Injection Pumps
Inline fuel injection pumps contain a series of individual pumping elements. One element per cylinder.
As you may have guessed from the name, these pumps are arranged inline.
Inline pumps are known for their durability and are commonly used in heavy-duty applications. They’re also easier to repair since you can access individual cylinders.
These pumps have been used for many years and many trucks and heavy duty equipment use them today.
Rotary Distributor Pumps
Rotary Distributor pumps use one pumping element to feed fuel to each cylinder.
These types of fuel injection pumps became very popular during the 80’s and 90’s. They’re known for their compact design and are commonly found in passenger vehicles.
Rotary pumps also have a lower cost of production which is why they were so popular for so many years.
Common Rail Systems
Common Rail fuel injection pumps are the latest and greatest in engine technology.
Instead of having an individual pump for each injector, common rail systems use one high-pressure pump. This pump feeds a “rail” or reservoir that fuel injectors pull from.
Because fuel injection timing is handled by the injectors and not the pump, you can achieve far greater control and precision.
According to engine technology leader Bosch, direct injection engines can see a 15% improvement in fuel economy. Not to mention a significant increase in low-end torque.
Symptoms of Fuel Injection Pump Problems
How do you know if your fuel injection pump is going bad?
Here are a few signs to look out for:
- Engine Hard Starting
- Loss of Power
- Rough Idle
- Black Smoke Coming From Exhaust
- Fuel Mixing in With Engine Oil
If you experience any of these issues, don’t wait for the problem to go away.
Just like any other part on your engine, a fuel injection pump will never fix itself. The problem will only continue to get worse.
And eventually you could be stuck with a full engine replacement or towing fees.
Better to be safe than sorry.
Why Quality Matters for Fuel Injection Pump Sales
When the time comes to buy a new fuel injection pump for your engine, don’t settle for cheap.
Unfortunately, there are a lot of cheap pumps being sold online.
You might get lucky and find one that works for a couple months. But chances are they won’t live up to your expectations.
A quality fuel injection pump will provide you with:
- Better fuel atomization due to tighter tolerances
- Higher quality materials that will last longer
- Thoroughly tested and tuned before shipping
- Longer lifespan which means a lower total cost of ownership
Not only is the fuel injection pump market growing. The number of pumps being manufactured all over the world is growing.
With new factories popping up every day, quality control is slipping.
Do your homework.
Find trusted suppliers who specialize in fuel injection parts. Ask questions about their warranty, how they test, and where the pumps are made.
Your engine will thank you later.
Let’s Review…
There you have it! Now you know how fuel injection pumps work.
If you want your engine to run smoothly and efficiently you need to know how it’s fuel delivered.
Remember:
- Fuel injection pumps deliver pressurized fuel to each engine cylinder
- There are 3 main types of fuel injection pumps
- Don’t ignore these warning signs
- Never buy a fuel injection pump without researching the supplier
Maintaining a fleet of trucks or just one diesel vehicle can be expensive.
Knowing how your engine works is powerful information that can save you money in the long run.
Now that you have it, use it.