Fuel filter

Learn all there is to know about the fuel filter

Before change your fuel filter,


Decarbonization cleans your engine in only 30 min!

Preventive engine cleaning enables you to restore engine parts rather than replacing them, thereby saving vehicle owners on costly parts, such as a new turbocharger (1.350€ - 3.100€), catalytic converter (600€ - 2.000), DPF (600€ - 2.000€) or EGR valve (370€ - 500€).

These problems result mainly from poor combustion, which stifles the engine.

So before replacing your engine parts, try Carbon Cleaning. A dirty engine as the result of carbon deposits is the new threat to vehicle performance.

Make your online diagnosis
Fuel Filter Basics

In order to know the true importance of a fuel filter, or any automotive part for that matter, it is crucial to know where it is located and what its function or purpose is. The fuel filter is positioned between a car's fuel pump and the fuel injectors. Its primary purpose is basically to aid the fuel pump's performance by filtering out deposits in the gasoline being transferred to the engine. More specifically, as the fuel pump supplies gas to the engine, it is the fuel filter's job to serve as a sort of barrier, ensuring that only gas of an acceptable purity is pumped into the engine. In this way, the fuel filter eliminates much of the contamination in the fuel, protecting the fuel pump and fuel injectors as the gas is sprayed into the engine.
Common Fuel Filter Problems

In screening out various impurities, the fuel filter can often get so soiled and even clogged that it won't carry out its functions efficiently. This in turn will have its bearing on the general performance of the car, causing a variety of unpleasant and often dangerous problems.

No Vehicle Start Up
If the fuel filter is so clogged that it completely blocks the fuel and does not allow its flow into the engine, the car will simply refuse to start. Remember, the car will start only if fuel is supplied and ignited inside the engine.

Difficult Vehicle Start Up
When the fuel filter is partially obstructed with dirt, it will restrict the flow of fuel to the engine and cause problems when you try to start the car. As the filter is not completely blocked, it will permit a small amount of fuel to pass through which will eventually ignite the engine. However, this is a problem that should be addressed as soon as possible, or it may lead to rather expensive consequences.

Engine Hesitation
Engine hesitation is another problem that is frequently caused by a dirty filter, which does not allow a sufficient inflow of fuel into the engine. The problem is most conspicuous when the car is accelerated from a stop.

Erratic Low Speed Performance
It is quite typical for a car with a soiled filter to operate perfectly well at high speeds but hesitate at lower speeds. This is due to the different levels of fuel flow pressure from the fuel pump. With higher speeds, the fuel pump exerts greater pressure on the flowing fuel, and it can pass through the obstructed filter and into engine, which ensures the proper operation of the vehicle. However, at lower speeds, the fuel pump pressure is not strong enough to feed the necessary amount of fuel into the engine, thus causing disturbances in its performance.

Die-Out of an Operating Engine
Sometimes, a dirty filter will make the engine stall while the car is still driven. This is often the result of an uneven flow of fuel through the filter. At times there will be enough fuel to maintain the smooth running of the engine, and other times it will be blocked to such an extent that the vehicle cuts out.
The severity of this problem can vary depending on the type of debris that has stuck in the filter and the strength of the fuel pump.

Rough Idling of the Engine
The rough engine operation at idle speed can also stem from obstruction of the fuel filter. A rough idle is often caused by too much engine combustion due to a damaged or severely soiled filter blocking the normal fuel flow and hampering the proper mixture of fuel and air in the engine.
Fuel Filter replacing

Changing your fuel filter is fairly straightforward and takes about a half an hour. It costs around $20 to do on your own (the price of a new fuel filter and washers). Here’s how to do it:

1. First and foremost, relieve the fuel system pressure by locating the fuel pump fuse on the fuse box. Start your car, leave your engine running, and pull the fuse or relay out. You will know you have done this right if your engine dies.

2. After relieving the fuel pressure, you can use two wrenches to disconnect the fuel lines from the fuel filter. Be sure to use a rag to cover the lines after you get the wrenches in place just in case there is still some pressure in the lines. Hold the wrench that is on the filter while turning the other wrench until the bolt comes out.

3. Slide the fuel line off the bolt and repeat on the other side.

4. Remove the old filter. You may need a flathead screwdriver to do this. Be careful as gas may still be in the old filter.

5. On the bolts you removed in steps 3 and 4, there will be washers. Remove the old washers and replace with new ones.

6. Install the new filter by doing the opposite of what you did to remove the old one. Put the fuel pump or relay back on before you try starting your car.

Center Locator
Find the Carbon Cleaning center closest to you
With the Carbon Cleaning solution,
you can help extend the life of your car engine
without the need to replace so many expensive parts.
Locate a center
near you :
Become a distributor-partner of Carbon Cleaning
As a member of the Carbon Cleaning network,
you are an independent vendor. To help you grow
your business, we put all of our experience and expertise
at your disposal.
Contact us with any questions
or for more information about how to become a partner.
Professional Information and Contact
Already have a Carbon Cleaning Pro account? Sign in!
Discover our new machines !!!
Replace the coolant in less than 5...
Thanks to our Flash Cooling stations, the draining, bleeding and replacement of the coolant is carried out in less than 5 minutes. Increase your turnover and save time with these...
Discover our new machines !!!