A FASS filter is a diesel fuel filter. As the name says, it filters all the dirt in fuel and keeps it from entering the fuel system. An old, clogged, and worn filter will impact the performance and overall work of the engine. That is why you should do regular maintenance.
But, how often should you change the FASS filters? It depends on several factors. A lot of stop-and-go traffic and bad overall maintenance will require more frequent visits to the mechanic. Also, the type of filter is important. The manufacturer recommends changing the filter every 15,000 or 30,000 miles depending on the type of the filter. But, if you notice any problems, change it sooner.
Stay with us, and you will learn everything about this rarely-mentioned but important component. We will cover the types of FASS fuel filters and what they do. Also, we will discuss how often they should be replaced and what signs are pointing to them.
What are FASS Filters?
A FASS filter is a combination of the diesel lift pump and fuel filtration system. It is designed to prevent dirt from entering the fuel system. There are different types of dirt, such as screen dirt and rust particles, that can wreak havoc on the fuel system. Also, water is an enemy of the diesel engine, and the FASS filter keeps it out of the system.
The filter improves the diesel fuel mileage and the performance of the engine. While it is keeping the performance fuel system properly, it also extends the work life of the fuel injectors.
Description of FASS Filters
The FASS filter is a fairly simple component. The filter is made of a special type of paper. It is placed in a container that is made of steel or plastic. Through it flows the fuel that is cleaned. It is always located between the fuel tank and the engine.
Types of FASS Filters
There are two types of FASS filters:
- Standard FASS filter. These filters have a work-life of 15,000 miles.
- XL FASS filter. This series is also called the FASS titanium series of filters. They have an extended work life of 30,000 miles.
How FASS Filters Work
All fuel filters work on the same principle. Fuel is passing through the filter that catches any contaminants. From the filter comes clean fuel. FASS filters have one key difference from gasoline fuel filters. There are two filters for these engines. One is located between the fuel tank and the engine, while the other is closer to the engine.
The fuel injection systems on newer engines are very sensitive. That is why the fuel filters need to be cleaned. If any contaminants enter the fuel system, it can cause problems with the FASS lift pump and fuel injectors.
Check Out FASS Fuel Systems “How It Works”:
Why Is It Important to Change FASS Filters Regularly?
It is important to change the FASS filter before it is clogged up because that will reduce performance.
Consequences of Not Changing Filters
If you don’t replace the filter, the dirt and rust will get into the fuel system. That will create debris. The debris is harmful to the whole fuel system. That will lead to problems with the fuel pump, and injectors affecting fuel distribution.
Cost-Effectiveness of Regular Filter Changes
The price of filters is between $20 and $100. They are not pricey to replace and will bring a lot of good. A new filter gives a new and fresh life to the whole engine.
How Often Should FASS Filters Be Changed?
Depending on the style of driving and the overall quality of the filter, the figure varies between 15,000 and 30,000 miles.
Manufacturer Recommendations
The manufacturer’s recommendation is 15,000 miles for the standard set of filters and 30,000 for an XL set of filters.
Factors That Can Affect Frequency Of Filter Changes
The price will almost always reflect the quality. Pricier filters are made of better and more robust materials. Their filtration rate is higher, and overall work life is prolonged.
How To Monitor Filter Condition
If you notice problems with engine work, you can check the filter yourself. Some fuel filters have a see-through plastic casing. It allows a user to check the filter for any blockades. If the container is made of metal, you can still look at the filter and check its condition.
Symptoms of Dirty Filters
If you notice any of these problems, head out to the mechanic. These problems can point to a problem with the fuel filter:
Difficulty starting the engine
Several problems can cause this issue, but a bad fuel filter is high on the list.
The car is shaking at low speeds
The engine can run well at normal speeds, even with a bad filter. But if you notice the problem with acceleration at low speeds then you should check your fuel filter.
The engine is rough idling
A clogged filter fuel will not deliver enough fuel to the engine. That will cause problems with idling.
Signs That FASS Filters Need To Be Changed
If you go to the mechanic only when you feel that something is wrong, you should know how to diagnose a clogged FASS filter.
How To Diagnose a Clogged Filter
If you did a visual inspection and noticed any of these symptoms, then you should change it. Also, it is worth checking when you replaced it last time.
How To Change FASS Filters
Changing modern FASS filters is fairly easy. They are located close to each other and are easy to see. They are screwed in place; you only need to unscrew them. After you do it, bleed the air bubbles out of the system. No air should be left in a fuel system before you place new filters.
When you are changing the filters, it is recommended to change the gasket. The gasket should be moistened with the fuel before applying.
Tips For Maintaining FASS Filters
There is not much you can do to maintain the FASS filter. They have their work life, and after it, they need to be replaced. Although, there are a couple of things you can try to keep the filters working longer.
Preventative Measures To Prolong Filter Life
- Use fuel quality that is good. There are a lot of different diesel fuels on the market. Filters are sensitive to low-quality fuel. If you can find a gas station with good fuel, use it regularly
- Style of driving. Stop-and-go driving in the cities will speed up the time for replacing the FASS filters. If you can, avoid gridlocks when you can.
Check Out Fuel Filter Basics: How Often to Change FASS Filters on Your Duramax Engine:
FAQs
How Long Does a FASS Fuel Filter Last?
It is recommended to change the FASS filter every 15,000 miles.
How Long Do FASS XL Filters Last?
FASS XL filters last 30,000 miles per manufacturer.
Final Considerations
All filters in the car need regular replacement fuel and maintenance. Either an air, oil, or fuel filter. FASS filters have a work-life of 15,000 and 30,000 miles, depending on the type of filter. These filters keep dirt, rust, and water out of the fuel system, so change them regularly.
Their price varies between $50 and $100; for that, you get an important fuel system component. Visit the mechanic regularly and check all your fuel system components. Avoid bad fuel, because it can cause a lot of problems. For any additional info about Duramax engines, stay with us!
