How to Change the Fuel Filter on Mazda Cars

by Contributing Writer; Updated June 12, 2017

The job of protecting the fuel injectors in your Mazda car from sediment and other contaminates found in today's gasoline falls to the fuel filter. The large filter area and capacity of the high pressure filter found in the Mazda car ensures that the fuel is filtered effectively while maintaining the proper pressure and volume required to meet your engine's needs throughout the entire range of operation. Replacement of this filter as a part of preventive maintenance is well within the abilities of the home mechanic and in most cases can be accomplished in under an hour.

Under The Hood:

 How to Change the Fuel Filter on a Mazda B3000

Park the Mazda B3000 in a ventilated environment such as outside.

Remove the gas cap from the tank. Taking the gas cap off of the gas tank will remove the high pressure from the fuel filter and the fuel lines.

Jack the passenger side rear of the Mazda B3000 up. Place a jack stand under the designated jacking point on the rear driver side. Lower the jack so that the Mazda B3000 is resting securely on top of the stands. Leave the jack in the up position.

Locate the fuel filter inside the rear passenger side frame rail near the fuel tank. The fuel filter is mounted inside of a bracket and has a fuel line coming out of each end.

Position the drip pan under the fuel filter. Remove the safety clips from the end of both fuel lines and the fuel filter pipes with the flat head screwdriver. Slide screwdriver under the safety clips and pry them upward until the clips come off.

Locate the plastic locking clips holding the ends of the fuel lines to the fuel filter. Slide the screwdriver under the locking clips and pry upward. Wiggle the locking clip as you are prying upward. This will release the locking clip from the fuel filter pipes. Finish prying the locking clips until they are completely out of the end of the fuel lines.

Pull both fuel lines straight off of the fuel filter pipes. Wait for the small amount of excess gas to flow out of the fuel filter and the fuel lines into the drip pan. Slide the old fuel filter out of the bracket. Put the fuel filter into the drip pan.

Slide the new fuel filter into the bracket. Make sure that the arrow on the side of the new fuel filter is facing the front of the Mazda B3000.

Push the fuel lines completely onto the fuel filter pipes. Take the new locking clips and push them down through the holes in the top of the fuel lines. Wiggle the fuel line gently as you are pushing the locking clip into the hole until the locking clips lock to the fuel filter pipes. Carefully pull out on the fuel lines just to make sure the clips are securing the fuel lines to the fuel filter.

Push the safety clips back over the fuel lines and the fuel filter ports with your hand. Remove the drip pan from under the Mazda B3000.

Screw the gas cap back on to the tank. Turn the ignition key on for about five seconds and then off again. Do this three times. Then crank the engine on the fourth turn. This process will fill the new fuel filter with gas and remove all of the air. Let the engine run for about 30 seconds and then turn the engine off.

Inspect the new fuel filter for gas leaks. Jack the rear of the Mazda B3000 back up and pull the stands out. Slowly lower the Mazda B3000 back to the surface and pull the jack out.

Items you will need

  • Jack

  • Jack stands

  • Drip pan

  • Flat head screwdriver

  • New fuel filter

 How to Change a Fuel Filter on a Mazda Pickup

Park the Mazda pickup in a well ventilated area so that the gas fumes can escape.

Unscrew the gas cap completely off of the fill neck on the gas tank. Locate the fuel pump fuse in the fuse box and remove it. Start the engine and let it idle until it stalls. This will depressurize the fuel system. Turn the ignition key off. Disconnect the negative (black) battery cable.

Jack up the rear of the Mazda pickup from a safe jacking point. Once that the truck is jacked up high enough, place a jack stand under the proper jacking points on both sides of the truck. The rear jacking points will be in front of the rear tires. Then, slowly lower the truck onto the top of the stands and leave the jack upright.

Crawl under the rear passenger side of the truck and locate the fuel filter that is mounted inside of the frame rail, just ahead of the gas tank.

Slide the gas catch pan directly under the area of the fuel filter. Remove the safety clips from the fuel filter and the fuel lines with the pliers. The safety clips are attached to the end of the fuel lines and the end of the fuel filter ports.

Locate the small plastic clips at the end of the fuel lines. Slide the flat head screwdriver under the plastic clips and pry them out of the fuel lines. Be sure to be holding the fuel line with one hand while prying the clips out of the fuel lines. Then, pull the fuel lines off of the fuel filter tubes.

Slide the fuel filter out of the round bracket and put it into the gas catch pan. Then, position the new fuel filter into the bracket with the flow arrow on the new filter pointing in the direction of the engine.

Push the fuel lines straight onto the fuel filter tubes. Once that the fuel lines are pushed on to the tubes, make sure that the fuel lines are past the raised ridges on both fuel filter tubes. Then, slide the new plastic clips into the end of the fuel lines. These clips secure the fuel lines to the fuel filter tubes.

Press the safety clips back over the fuel lines and the fuel filter ports with your hand. Then, carefully pull out on the fuel lines just to make sure that they are secure. Remove the catch pan from under the truck.

Lower the truck to the ground. Reinstall the fuel pump fuse and reconnect the negative battery cable. Screw the gas cap completely back onto the fill neck of the gas tank. Get in the drivers seat and turn the ignition on and off four times to prime the new filter. Crank the engine on the fifth turn.

Go back to the rear of the truck and inspect the new fuel filter for any type of leaks with the motor running. Turn the engine off.

Items you will need

  • Floor jack

  • Jack stands

  • Gas catch pan

  • Pliers

  • Flat head screwdriver

  • New fuel filter

 How to Change the Fuel Filter on an RX-7

Park the Mazda RX-7 in a safe and well ventilated location and set the parking brake.

Unscrew the fuel cap from the fuel tank to release the gas pressure off of the fuel filter.

Jack up the rear of the Mazda RX-7 and set the jack stands under the designated jacking points on both sides of the car. Lower the jack slowly so that the rear of the RX-7 is sitting securely on top of the stands. Leave the jack sitting in the up-right position as an extra safety precaution.

Crawl under the rear passenger side of the car and remove the two floor plates from both sides of the rear differential. The differential is above the gas tank. The floor plates are secured by 10 mm bolts. Unscrew the bolts with the ratchet, extension and a 10 mm socket.

Pull the floor plates down and set them aside. The fuel filter can now be accessed easier. Locate the two mounting bolts on the bottom of the fuel filter bracket. Loosen and remove the two bolts with the ratchet and a 10 mm socket.

Reach up and pull the fuel filter down enough to be able to access the clamps that secure the fuel lines to both sides of the fuel filter. Release both clamps by squeezing them together with the pliers and sliding the clamps about two to three inches back onto the fuel lines.

Twist and pull out on the fuel lines at the same time to remove the fuel lines from both sides of the fuel filter. If the lines are stuck, use the pliers to twist and pull out on the fuel lines until the lines are free from the fuel filter. Pull the fuel filter out and discard into the catch pan.

Push the fuel lines back onto both sides of the fuel filter. Slide the clamps back over the ends of the fuel lines with the pliers.

Position the new fuel filter with bracket back up to the area of the old filter. Line up the bracket holes and screw the two mounting bolts back through the fuel filter bracket. Tighten the bolts with the ratchet and 10 mm socket.

Screw the fuel cap back onto the fuel tank. Move to the driver seat and turn the ignition to the accessory position for about five seconds and then back off. Repeat this three times to properly prime the new fuel filter with gas. Crank the engine and inspect the new filter for leaks with the engine running. Turn the engine off.

Reinstall the floor plates below the fuel filter with the 10 mm bolts. Tighten the bolts tightly with the ratchet and socket.

Jack the rear of the Mazda RX-7 back up and remove the safety stands. Lower the car back to the ground.

Items you will need

  • Jack

  • Jack stands

  • 3/8-inch drive ratchet

  • 3/8-inch drive metric socket set

  • Pliers

  • Gas catch pan

  • New fuel filter

 How to Change the Fuel Filter on a Mazda 626

Park the Mazda 626 and open the hood. Walk to the rear of the car and remove the gas cap from the gas tank. This will remove the high gas pressure off of the fuel filter.

Walk back to the front of the car and look down into the driver-side engine bay and locate the silver round fuel filter canister. There is an air intake assembly that will need to be removed to be able to reach the fuel filter.

Unscrew the small bolts that hold the air intake assembly to the driver side of the engine compartment. Pull the air intake out and set it to the side.

Look down into the driver-side engine compartment and you can now see the top of the fuel filter. Slide a small catch pan or container under the fuel filter.

Locate the spring clamps that are holding the top and bottom fuel lines to the fuel filter. Use the pliers to compress the clamps and slide the clamps down on the fuel lines. Then, pull the fuel lines off the fuel filter and let them hang down towards the catch pan.

Pull the fuel filter out of the flexible bracket and discard the old filter into the catch pan. Insert the new fuel filter into the flexible bracket. Make sure that the flow arrow on the fuel filter is directed towards the engine.

Push both of the fuel lines onto the fuel filter ports. There is a raised groove on the fuel filter ports that hold the fuel lines onto the fuel filter. Push the fuel lines past this area. Then, pull the catch pan out of the engine compartment.

Reattach the air intake assembly and tighten down the small bolts with the 3/8-inch drive ratchet and sockets.

Screw the gas cap back on the gas tank. Crank the engine and inspect the new fuel filter with the engine running.

Turn the engine off and close the hood.

Items you will need

  • 3/8-inch drive ratchet

  • 3/8-inch drive sockets

  • Small gas catch pan

  • Pliers

 How to Change the Fuel Filter on a Mazda Tribute

Raise the left rear of the vehicle with a floor jack and place a jack stand under the rear sub-frame to support the weight of the vehicle should it fall. Every year people are injured or killed by not following this simple safety step.

Turn the ignition off and remove the fuel filler cap to relieve any pressure that has built up in the fuel tank from evaporating fuel. This will prevent fuel from spraying and running down your arm when you release the fuel lines.

Use the fuel line quick disconnect tool to remove the lines from the fuel filter by slipping the tool into the quick disconnect until it spreads the retainer and allows the line to be removed. Push the line onto the filter while pushing the tool into the fitting, then pull the line off the filter. When both lines are free, unsnap the filter from the bracket.

Snap the new filter into the bracket, noting the markings that indicate flow. Flow should always be toward the engine. Push the line fittings onto the filter nipples until a click is felt, and the line can no longer be pulled off the filter.

Prime the fuel system by turning the ignition key to the "Run" position for two seconds and then to the "Off" position. Do this three times and then start the engine. Check the filter quick disconnects for leaks then test-drive.

Items you will need

  • Floor jack

  • Jack stands

  • Fuel line quick disconnect tools

  • New fuel filter

 How to Replace a Fuel Filter in a Mazda6

Take the fuel pump fuse out of the fuse box-this prevents gas from spraying upon disconnection of the fuel lines.

Select two open-end wrenches and remove the fuel filter fittings. You will need two wrenches because the fittings will be two different sizes.

Plan to use a cleaning rag to throw over the fuel lines to protect you from the spray of gas. Release of the pressure can cause a large spray of gasoline that can burn your skin and eyes.

Determine which wrench to turn counterclockwise and which will hold the filter in place. The banjo fitting is the special bolt you need to remove.

Slide the fuel line from the bolt and then repeat the disconnection on the opposite side of the filter.

Prepare the new filter for installation. Take it out of the box, make sure there are no cracks or dents and that the connection threads are smooth.

Undo the clamp that holds the fuel filter in place. Put the new filter in the old spot and tighten the clamp with a flat head screwdriver. Plug the fuel pump fuse back in and start the Mazada6.

Items you will need

  • New fuel filter

  • Open-end wrench set

  • Screwdriver set

  • Cleaning rags

 How to Replace the Fuel Filter in a 1998 Mazda Protege

Place wheel chocks behind the rear wheels of the Mazda. Use a floor jack to raise the front driver side of the car off the ground. Place jack stands under the frame near the front of the car, and lower the car onto the jack stands so that the weight of the car is supported by the stands and not the jack.

Open the hood and locate the fuel filter. The fuel filter on the Mazda Protege is located on the firewall to the left and below the power brake booster. Using a 10-mm socket and socket wrench, loosen the upper (outlet) fuel line clamp. Place needle nose pliers between the filter and the fuel line, and pry the line off the filter. Loosen the fuel filter clamp on the fuel filter bracket and push the filter out of the bracket. From under the car, loosen the 10-mm hose clamp on the lower (inlet) fuel line and remove it from the filter using the needle nose pliers. Drain the fuel filter into the drain pan.

Install lower line on new filter, and tighten the fuel-line clamp securely. Push the filter into the fuel-filter bracket from underneath, and tighten the bracket clamp. Install the upper fuel line onto the filter, and tighten the fuel line clamp securely.

Prime the filter by turning the ignition key to the run position and then to the off position three times. Start the engine, and check for leaks. Raise the car off the jack stands with the floor jack and remove the stands. Lower the car to the ground and remove the jack and wheel chocks. Test drive to verify the repair is complete.

Items you will need

  • Needle nose pliers

  • Floor jack

  • Jack stands

  • Wheel chocks

  • Socket set

  • Drain pan

 How to Replace the Fuel Filter on a Mazda Millenia

Park the Mazda Millenia on a level surface in a well-ventilated area.

Unscrew the fuel cap from the fuel tank. This will remove pressure from the fuel filter.

Open the trunk and pull the carpet cover back away from the rear of the trunk. Then pull the spare tire out and set it outside of the Mazda Millenia.

Locate the metal cover that is in the very rear of the trunk. This cover has three nuts holding it in place. Remove the three nuts with the 3/8-inch drive ratchet and the 10 mm socket. Pull the cover out and place it outside of the trunk. You can now access the fuel filter.

Position the small fluid catch pan as close to the underside of the fuel filter as possible. Remove both rubber fuel lines from the fuel filter by grasping the end of the fuel lines with the pliers and rotating the fuel line back and forth while pulling out on the fuel line. Keep doing this until the fuel line slides off of the fuel filter stops. Do this to both rubber fuel lines.

Pull the old fuel filter out and discard it into the small catch container. Position the new fuel filter where the old fuel filter was, with the small arrow on the side of the fuel filter facing towards the engine. Then, push the rubber fuel lines straight onto the fuel filter ports until the fuel lines make it over the fuel line stops on the fuel filter ports. You may have to use the pliers to pull the fuel lines over the fuel line stops. Do this to both sides of the fuel filter.

Put the metal cover back over the fuel filter and screw the three 10 mm bolts back into the cover. Tighten the bolts down tight with the 3/8-inch drive ratchet and the 10 mm socket. Remove the small fluid container.

Put the spare tire back into place in the trunk. Then, place the carpet properly in place inside of the trunk. Close the trunk.

Screw the gas cap back onto the fuel tank. Make sure that the gas cap is screwed on completely until you can here it click. This will prevent air from entering the gas tank.

Slowly turn the ignition key on and off three different times. This will fill the new fuel filter inside of the car back up with gas. Crank the engine on the fourth turn of the key. Let the engine run for about one minute and then turn the engine off.

Items you will need

  • Small fluid catch container

  • 3/8-inch drive ratchet

  • 3/8-inch drive 10 mm socket

  • Pliers

  • New fuel filter

About the Author

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