Sylvie Willis
Fuel filters are an essential component of a vehicle's fuel system, screening dirt, dust, and other contaminants from the fuel before it reaches the engine. When choosing a fuel filter, it is important to consider the type of fuel your vehicle uses, the fuel flow rate, and the micron rating of the filter. The micron rating indicates the size of particles the filter can screen out, with lower ratings indicating finer filtration. Modern fuel filters are often compatible with different fuel types, but older vehicles may require specific filters, such as paper (or cellulose) filters, stainless-steel filters, or micro glass filters. The location of the fuel filter varies depending on the vehicle's make and model, with some located inside the fuel tank as part of the fuel pump assembly, while others are external and mounted outside the fuel tank. Before accessing the fuel filter for replacement, it is crucial to relieve the pressure in the fuel system and refer to the vehicle's repair manual for specific instructions.
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What You'll Learn
Check your vehicle's repair manual
The fuel filter is an integral part of the fuel supply system in your vehicle. Its purpose is to clean the fuel before it reaches the engine. An unclogged filter prevents contaminants like dust, dirt, and rust from entering the combustion and fuel chambers by removing these particles. Therefore, it is important to know how to check and change a fuel filter when necessary.
Checking your vehicle's repair manual is a good way to find out information about your fuel filter. The repair manual will provide instructions on how to check your fuel pump. Firstly, you will need to locate your fuel pump test point, which is usually near the fuel injectors. Then, locate the point at which the pump hooks up with the filter injector rail. There should be a separation joint or a test port, where the pressure gauge attaches. The location of the fuel pump varies from vehicle to vehicle, so the repair manual can provide specific instructions.
The repair manual will also instruct you to have a helper rev the engine while you check the gauge. You should let the engine warm up slightly, then check the pressure at idle speed and at the rated speed listed in your pump specifications. If there is a serious problem, the needle won't move, or will go below specifications, meaning the fuel pump needs to be replaced. The pressure should match the specifications listed in the repair manual and increase as the engine is revved.
Additionally, the repair manual will inform you that before checking your fuel pump, you should find the fuse that corresponds to the pump and pull it out to see if it is broken or burned. If it looks fine, you can check the voltage at the pump itself to make sure the charge is getting to the pump. If this looks alright, then perform a fuel pressure test. Get a fuel pressure gauge and hook it up to the fuel pump test point, and have a helper rev the engine. If the needle doesn't move, you have found the problem.
Finally, the repair manual will provide information on how to eliminate the filter as a possibility. If the filter gets clogged with sediment, it can cause trouble accelerating and you might suspect your fuel pump is the issue. To check this, remove the filter from the vehicle and drain excessive fuel from the filter. Use a short piece of rubber hose on the filter inlet and blow through it, paying attention to the resistance, which should be minimal.
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Consult a mechanic
If you're unsure about which type of fuel filter your vehicle uses, it's best to consult a trusted mechanic. They will be able to advise you on the right type of fuel filter for your car and help you source a high-quality replacement part.
Fuel filters come in different types, dimensions, and sizes, and your mechanic will be able to determine which one is compatible with your vehicle. For example, some fuel filters are restrictive, which means they might not pass enough fuel when they begin to clog. Knowing your vehicle's fuel flow rate will help you choose a filter that will suit your car.
Additionally, different types of fuel filters have different micron ratings. A micron is so small it can't be seen by the naked eye, but the lower the micron rating, the smaller the particle the filter will reliably filter out. Your mechanic will be able to advise on the best micron rating for your vehicle.
If you have an older car, it probably has an external fuel filter that requires routine service. Your mechanic will be able to advise on the recommended replacement schedule for your vehicle's fuel filter.
Finally, if you're unsure about replacing the fuel filter yourself, a mechanic can do it for you. Replacing a fuel filter is a fairly inexpensive service, with most options costing under $30, although some special parts can cost up to $100 or more.
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Identify the micron rating
Micron ratings are an important part of any filtration system, as they help determine the amount and size of debris that gets filtered or removed from liquids. The micron rating of a fluid filter is a generalised way of indicating the ability of the filter media to trap particulates by the size of the particulate it is exposed to. A micron, also known as a micrometer, is a unit of measurement equal to one-millionth of a meter, meaning there are 1,000 microns in a millimetre.
There are two popular ways to communicate a micron rating: nominal and absolute. A nominal micron rating means that a filter can trap a given percentage of particulates of a certain size. For example, a 10-micron filter with a nominal rating of 50% will trap half of all particulates that are 10 microns or larger. An absolute micron rating, on the other hand, lets the user know what percentage of particulates of a certain size will be trapped by the filter media. An absolute micron rating can be determined by single-pass or multi-pass testing, where a test fluid containing particles of a known size is passed through a filter, and all particles that pass through are counted and measured. For instance, a 10-micron fuel filter with an absolute micron rating of 99% will trap all but 1% of the particulates 10 microns or larger.
When choosing a fuel filter, it is important to consider the micron rating in relation to the specific application. For example, a fuel system pre-filter (before the pump) typically has a micron rating of 25 to 400, while a fuel system final filter (after the pump) usually has a micron rating of 1 to 40. High-performance fuel injector manufacturers typically recommend a 10-micron or finer filter. It is also worth noting that, for any given size, a coarse filter will flow better than a fine filter, so coarse filters are usually recommended for thicker fluids and as pre-filters.
- 40-micron filters are generally used for carbureted engines after the fuel pump, along with a 100-micron pre-filter.
- 10-micron filters are used after the fuel filter with fuel-injected engines and must be used with a 100-micron pre-filter.
- 25-micron filters can filter out anything larger than the size of a white blood cell and are commonly used in chemical processing industries.
- 50-micron filters can only filter out particles that can be seen with the human eye, such as the diameter of human hair, but they are versatile and popular in many industries due to their ability to filter a lot without clogging issues.
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Know the fuel flow rate
Knowing your fuel flow rate is essential for choosing the right fuel filter. The flow rate of a filter describes the amount of fuel that can pass through it per unit of time, typically measured in litres per hour or gallons per hour.
To determine the flow rate, you can either consult the engine manufacturer's documentation or contact their technical support team. If this information is not available, a common rule of thumb is to multiply the engine's horsepower by 18% or 20% to estimate the required flow rate in gallons per hour. This rule applies specifically to standard diesel fuel applications and may need adjustments for other fuel types.
It's important to select a filter that matches or exceeds your required flow rate. Using a filter rated below your flow rate may starve your engine of fuel and cause issues. On the other hand, choosing a filter rated too high will increase the initial purchase cost and the price of replacement elements.
Contaminants in the fuel can also impact the flow rate. Over time, contaminants will gradually reduce the flow rate. Water contamination, for example, can cause an abrupt reduction in flow rate. Therefore, it is recommended to regularly inspect your fuel for contaminants and replace the filter accordingly.
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Understand the location
The location of your car's fuel filter depends on the vehicle's make and model. Most vehicles built within the last 10 to 20 years do not have serviceable fuel filters. Instead, the filter is part of the fuel pump module located inside the fuel tank. This type of fuel filter should last the life of the vehicle, so you shouldn't need to replace it. However, if you have an older car, it probably has an external fuel filter that requires routine service. These filters are usually mounted outside of the gas tank on the frame rail, fender, or shock tower.
Fuel filters are typically found somewhere between a vehicle's engine and fuel tank, either inside the fuel tank itself or along the fuel line running underneath the vehicle. Some vehicles have fuel filters in the engine compartment, while others have them underneath the vehicle. Certain models, such as the 2002 Toyota Corolla, have the fuel filter underneath the rear seat cushions.
Before accessing your fuel filter, it's important to relieve the pressure in the fuel system. This can usually be done by allowing your engine to run for a minute or so without the fuel pump functioning. Additionally, you may need to remove any parts sitting over the filter, such as the intake manifold. If your vehicle has its fuel pump in the back, you'll need to access the trunk to reach the filter.
It's worth noting that diesel fuel filters and their replacement methods differ from those on gas-powered vehicles. Different automakers use different methods to secure the fuel filter to the fuel line, such as flare nuts, quick-connect fittings, and hose clamps. When determining the type of fuel filter your vehicle uses, consider factors like the vehicle's fuel flow rate and the filter's micron rating. A lower micron rating indicates that the filter can screen finer contaminants.
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Frequently asked questions
If you own a newer vehicle, your fuel filter is likely attached to the fuel pump module that’s located in the fuel tank and should last the life of the vehicle. If you own an older car, it probably has an external fuel filter that requires routine service. You can determine when and if your car’s fuel filter requires replacement by consulting the manufacturer’s recommended maintenance schedule in your owner's manual.
The fuel filter is typically found somewhere between a vehicle’s engine and fuel tank. It’s usually inside the fuel tank itself in the opening of the fuel line or along the fuel line running underneath your vehicle. However, the exact location of the fuel filter depends on the vehicle’s make and model. For example, the fuel filter in a 2002 Toyota Corolla can be found underneath the rear seat cushions, while 1995-2002 Honda Accord models have the fuel filter near the brake master cylinder on the back of the engine.
There are different fuel filter types available on the market, such as primary, secondary, canister, cartridge, spin-on, inline, and in-tank fuel filters. Most modern fuel filters are compatible with different types of fuel, but it can still be helpful to know what type your vehicle uses so that you can ensure you’re ordering the right replacement. If you’re not sure which filter to buy, we recommend consulting your trusted mechanic.
Micron ratings on filters typically range between 2 and 100. The lower the number, the smaller the particle it will filter out reliably. 100 microns is great for pre-pump, but some newer pumps will require finer filtration, such as 80 or 10 microns. Choosing a filter with the right micron rating is crucial to preventing damage to fuel injectors, carburetors, and electric fuel pumps.
