Fuel Filter Manufacturer & Supplier

MZW manufactures fuel filters to OE specifications with guaranteed quality.

Our fuel filters are engineered with cellulose/glass filter media of high strength and superior filtering efficiency for a cleaner engine fuel.

Sturdy fuel filter housings are made from quality steel to withstand high pressures ensuring the longer life for the filter.

Automotive Fuel Filters

As a leading Fuel Filter manufacturing company, we know what you and your end-customer care.

Simple construction of our filters makes the installation and removal easy. Every fuel filter supplied by MZW have passed through rigorous factory tests to ensure it conforms to a high standard of quality.

  • Filter media with high rate of flow for enhanced efficiency of the fuel filter
  • Strong baseplate featuring a tuck-lock seam that can withstand pressure and avoid the possibility of leaks
  • Compatible with a wide range of vehicles and engines
  • Features a tube that returns the water that has been blocked by the filter to the fuel tank, saving the engine, fuel pump, and fuel injectors from damage
  • Filter media made of multi layers for better filtering action and longer life  
We guarantee you every MZW Fuel Filters has passed a series of strict tests:

Fuel Filter Cross Reference Lookup

Find the right fuel filter by entering the OEM number or cross reference number.

We are currently updating our fuel filter cross reference/OEM number database, will improve the Fuel Filter Search Function Soon.

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Automotive Fuel Filter

An automotive fuel filter is a fuel-filtering device found in modern automotive engines. The filter works to strain out dirt, rust, paint particles, and moisture or water that may be present in the fuel. Removing these contaminants protects the injectors and the fuel pump from wear and clogging. It also helps the fuel to burn efficiently, and the engine’s performance improves.
The primary fuel filter function is, therefore, to ensure that only clean fuel free from contaminants and moisture reaches the engine. The filter is usually a canister cartridge containing a filter element.

Why is the Fuel Filter Important?

Consider a car engine system that receives unfiltered fuel, what would happen?
Without the fuel filter, injectors would become clogged, worn out and damaged by rust, dust and other contaminants. Fuel spray would be poor, leading to low engine performance. Contaminants and moisture in fuel would also hamper the proper burning of fuel and cause your car’s engine not to perform optimally-with poor acceleration and even the possibility of breaking down and the car stalling. You would also risk incurring expenses replacing damaged injectors.

Table of contents

  1. What is a fuel filter
  2. Fuel filter type
  3. Fuel Filter Working Principle
  4. Fuel Filter Specification
  5. Fuel Filter Test

Fuel Filter Type

Fuel filters are mainly divided into diesel filters and gasoline/petrol filters.


Diesel Fuel Filter 

The structure of the diesel filter is similar to the oil filter, and it is available in both replaceable and spin-on versions. Diesel filters have much lower working pressure and oil resistance requirements than oil filters, but it requires higher filtration efficiency than the oil filter.


Gasoline Fuel Filter 

The fuel filter has a carburetor type and an EFI type.

For engines using the carburetor, the fuel filter is located on the inlet side of the oil pump, and the working pressure is small, generally using a nylon casing.

The fuel filter for the EFI engine is located at the outlet side of the oil pump and has a high working pressure, usually made of a metal casing.

The filter element of the gasoline fuel filter is mostly made of filter paper, and also uses nylon cloth or polymer material.


Automotive Fuel Filter Working

The fuel filter is a vital component of your car. It gives long life to the engine and ensures your car drives efficiently without hiccups or stalling. But how does it achieve this?

Let’s take a look at how a car’s fuel filter works, from how it receives fuel to how it filters out dirt, rust, and other contaminants.

Fuel gets pumped by the fuel pump through the fuel delivery system under high pressure. Before it reaches the engine, it passes through the fuel filter. The filter contains a filtering material that prevents contaminants and debris from passing through.

These contaminants then remain behind as clean fuel comes out of the filter and through the fuel delivery lines to the engine.

A filter has to remain permeable to fuel for it to be said to be working. When contaminants have accumulated to a point where not even fuel can pass through, the filter is no longer in proper working condition and the engine risks lacking enough fuel. It’s the time to change or clean the filter. In the case of bowl-shaped diesel filters, you need to manually drain the filter from time to time.


Fuel Filter Specification

Rated Volume Flow:Rated working flow of gasoline/diesel oil fluid through the assembly


Burst Pressure:Internal pressure when the fuel filter housing structure is damaged.


Pressure Drop: When the test gasoline/diesel oil passes through the fuel filter at a specified flow rate, the pressure difference at the inlet and outlet of the filter.


Filtration Efficiency: The ability of the new fuel filter to filter out impurities under specified test conditions.


Cleanliness: The quality of impurities flushed from the clean side of the fuel filter under specified test conditions


Dust Holding Capacity: When the pressure drop of the inlet and outlet of the filter increases to a specified value, the quality of the dust filtered by the fuel filter.


Fuel Filter Test 

With dirt and debris being trapped all the time, a fuel filter eventually becomes clogged. The length of time the filter stays before clogging depends on how long the engine runs, and the amount of contaminants contained in the fuel you use in your car.

You can easily know if contaminants have blocked your car’s fuel filter by observing how the engine behaves. Signs that the filter is restricting the flow of fuel to the engine include delayed acceleration or a car that stalls while driving.
Once you have every reason to believe that it’s the filter that is causing your engine’s performance to drop, you can proceed to test it.


How do you test a fuel filter?

Here, I give you steps on how to do a bad fuel filter test.

For the test, you will need one big straw or hose, whichever is available. You will also need an open-end wrench to loosen bolts. Have with you eyewear for the safety of your eyes, some rugs, and gloves to cover your hands.


Step 1:
Find the fuel pump fuse. Once you’ve found it, start the engine. As the engine runs, remove the fuel pump fuse. The engine should sputter and eventually die. This is the most important step to avoid injury from an explosion. It releases the fuel system pressure and allows you to safely remove the fuel filter by disconnecting it from the system.
Allow the engine to cool.

Step 2:
Locate the fuel filter. You can find it under your car’s hood connected to the fuel line or fuel delivery system. Sometimes, it’s located on the underside of the car; it depends on the car’s make and model. The filter is identifiable as the canister with hoses on both sides. These are the fuel delivery hoses pushing fuel through the filter.
If you cannot find the filter with ease, you will need to refer to your car’s manual for help with the fuel filter location.

Step 3:
Once you’ve found the filter, disconnect the fuel line lines from it. Make sure you have your eye protection on in case some pressure still exists in there. Cover the fuel lines with some rugs when disconnecting them to avoid the possibility of fuel splashing around. Remove the fuel filter by loosing the bolts that hold it in place. Use your open end wrench. Note that some fuel filters will require a special kind of wrench to loosen. Check first.

Step 4:
Proceed to check the filter for obstruction to the holes located on either side of the filter’s housing. If any of the holes is blocked, try to unblock it.

Step 5:
Blow air into the fuel filter using either a straw of large diameter or any other piping such as a hose. If the air you blow goes through the filter with ease, it means the filter is in perfect condition. If you experience difficulty or resistance blowing air through the filter, it means it’s clogged and will need cleaning or replacement.

When carrying out the fuel filter test don’t forget to disconnect the fuel pump fuse and to release the pressure in the fuel lines and fuel filter. Remember, too, to wear protective eyewear and gloves on your hands. Use rugs to cover the filter and the fuel lines when disconnecting them.

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