How to Change Your Fuel Filter

Regular fuel filter maintenance is one of the most important yet often overlooked aspects of vehicle care. A clean fuel filter ensures optimal fuel flow to your engine while protecting expensive fuel system components from contamination damage. Whether you're maintaining a daily driver or preparing a performance vehicle for track duty, understanding replacement fuel filter procedures can save you money and prevent breakdowns.

At Redhorse Performance, we understand that proper fuel system maintenance goes beyond just changing fuel filters. From high-quality fuel filters and fuel filter bracket assemblies to complete in line fuel filter replacement systems and aluminum fuel filler neck upgrades, we provide the components needed for reliable fuel system operation.

Step 1: Remove fuel pump fuse or relay

You will need to release the fuel system pressure before starting on any fuel system related projects to avoid dangerous fuel spraying. Find your car’s fuse box and find the fuel pump fuse or relay from your manual or fuse box diagram. The fuel pump relay is generally installed in the engine compartment fuse box or somewhere in the fuse box, but make sure to refer to the vehicle user manual.

Remove the fuel pump fuse or relay using the appropriate fuse puller tool. This simple step prevents the fuel pump from pressurizing the system during the replacement procedure, making the job safer and cleaner. Keep the removed fuse or relay in a safe location where you won't lose it during the repair process.

Step 2: Start your engine

With the fuel pump fuse or relay removed, start your engine and allow it to run until it stalls from fuel starvation. This process burns the remaining fuel in the lines and eliminates any residual pressure left in the fuel system making the filter change much safer and cleaner.

If the engine does not start, or runs but stalls immediately, the fuel system may be depressurized or there may be a fuel delivery problem. In any event, with the fuel system obstructions in mind, proceed with the next step.

Step 3: Disconnect the battery ground cable

In the interest of safety, it will be necessary to disconnect the negative battery cable to prevent any possibility of electrical sparks while working on the fuel system. Even tiny sparks can set off the fuel vapors, causing very hazardous conditions. Loosen the negative battery terminal clamp using an appropriately sized wrench and disconnect it from the battery post.

Place the disconnected cable aside so that it does not touch the battery terminal by mistake while repairing. Modern vehicles with complex electronic systems may require specific procedures when disconnecting the battery. Follow manufacturer recommendations to avoid triggering security systems or losing important calibration data.

Step 4: Have a drain pan ready

The fuel system components will retain some amount of fuel, even after pressure has been relieved from the system, so you will need a suitable drain pan for any gas that runs out during the replacement. Find a pan of sufficient size to catch any accidental fuel flow, and strategically place it beneath your work station.

Step 5: Push release buttons on filter

Quick-disconnect fittings are common on modern automotive fuel lines. Find these release devices at each end of the filter and know how to use them before you go on.

There are subtle differences between manufacturers, but generally there are tabs to push, clips to squeeze, or buttons to press when pulling the fuel line off the filter. Some systems will need special tools to easily release these fittings without damaging them.

If you have a lot of pressure under your hood, be prepared for a small fuel spill when you disconnect the lines to allow them to sit under the tap in the chemicals. The drain pan should be positioned to catch this fuel, and you should have absorbent materials ready for immediate cleanup.

Step 6: Recycle used fluids

Environmental safety includes the safe and environmentally sound disposal of used fuel and contaminated materials. Never pour gasoline into drains, on the ground, or into garbage cans. If your area auto parts store, service station, or recycling center doesn't accept used fuel, call your local city or county for assistance.

Step 7: Remove the filter

Unplug the old filter from where it was mounted after the fuel lines are unattached. Many filters are secured with a fuel filter bracket that may require removing bolts or clips to access the filter properly. Note the orientation and flow direction on the filter before removing it.

Some in line fuel filter replacement systems are located in difficult-to-access areas that may require removing other components for proper access. Take photos or make notes of the installation to ensure proper reassembly later.

Step 8: Install the new filter

Fit the new fuel filter in the proper position; make sure to note the flow direction arrows on the filter body. If a filter is installed backwards, the fuel flow will be blocked and can cause engine performance issues or damage fuel system components.

Make sure the new fuel filter will fit properly in the factory fuel filter bracket or mount. Upgraded aluminum fuel filler neck and mounting systems on some performance applications may lend themselves to better support and accessibility.

Step 9: Replace fuel pump relay

Replace the fuel pump fuse or relay you removed in Step 1 making sure it is well seated in the right socket. A faulty or mis-installed relay could lead to a fuel pump issue or the inability to start an engine.

Make sure that you are installing the component in the location in which it belongs, especially if you have more than one relay that looks the same. Adding the incorrect relay into the fuel pump connector would destroy certain electrical systems or cause improper function.

Step 10: Turn your ignition ON

After installing the new filter and changing the fuel pump relay, turn the key to the ON position but do not start the engine. This is to enable the fuel pump to charge the system and fill the new filter with fuel. You will hear a fuel pump whine for a few seconds as this happens.

Cycle the key on/off several times to pressurize the system and purge all air. By doing so, it prevents hard starting or rough running upon the initial start up of the engine.

Monitor the fuel system for abnormal noises or trouble signs when priming during that time. If unfamiliar sounds are heard, or if the pump fails to run, possible installation difficulties should be looked at.

Step 11: Check for leaks

Make a visual inspection for fuel leaks with the engine in the off position, and inspect the fuel line connections and mounting surface of the fuel filter when the engine is not running. Fire possibilities are opened up by even the smallest of leaks, and the problem must be remedied before the auto is used.

Inspect for any wet spots, fuel smell, or visible leaks that may be the result of loose fittings or a frayed rubber hose. Concentrate on the spots where you removed and reattached fuel lines while changing the part out.

If leaks are found, turn off the ignition immediately and address the problem before proceeding. Never operate a vehicle with fuel system leaks, as this creates serious safety hazards.

Conclusion

Regular fuel filter replacement is an essential maintenance feature that is often overlooked by other manufacturers. By following this advice and using RHP model specific hose, hose ends and adapter fittings, the results will be the same, and the life of the system will be maximized.

Whether you're performing basic maintenance or upgrading to performance fuel system components, understanding proper installation procedures is crucial for safety and reliability. From standard fuel filters to specialized fuel filter bracket systems and aluminum fuel filler neck upgrades, quality components make a significant difference in system performance.

Redhorse Performance provides the high-quality fuel system components and technical expertise needed for professional results. Our comprehensive selection includes everything from basic replacement filters to complete fuel system upgrade packages designed for demanding applications.