Fuel Filter Replacement
How are fuel filter issues diagnosed?
Changing the fuel filter normally does not require a diagnosis. They are most often replaced as scheduled maintenance, or as part of a repair necessitating early replacement of the fuel filter. If the fuel system is being diagnosed, the fuel filter may be replaced as a step in the diagnosis. If the fuel filter has been run past the replacement interval, or if it was noted that the fuel tank had contaminants in it, the filter will immediately be suspected of failure in the case of any fueling issue.
How is a fuel filter replaced?
For an in-line filter, there are two lines on either end of the filter that need to be released. Some GM vehicles require special tools to release the lines, while some European vehicles will require at least one line wrench to break the metal line fittings loose. The sealing washers will need to be replaced as well to prevent leaks from the new filter. If any debris or dirt are noted from the filter inlet line, the fuel tank will be inspected for corrosion and contaminants.
RepairPal Recommendations for fuel filter issues
We recommend using OEM quality or better when selecting a new fuel filter. Inferior fuel filters will allow contaminants pass through, and reach the fuel system more often.
What to look out for when dealing with fuel filter issues
Some older vehicles may locate the fuel filter on the firewall. When servicing this placement of filter, it is important to keep rags handy to catch fuel spilling from the filter. Removing a dripping fuel filter in a hot engine bay is a potential fire hazard.
Can I replace the fuel filter myself?
Depending on location of the filter, fuel filter replacement can be done at home by an intermediate DIYer. Most require lifting and safely supporting the vehicle in order to access the filter, and some will require removal of under-body paneling. Fuel filters are more easily replaced with a set of fuel line release tools. These are available from many auto parts stores, or online. They allow the technician, or DIYer to remove the fuel lines without breaking any of the fragile plastic clips. Care should be taken to catch fuel that falls from the filter or line during this service. Any time the fuel system is opened there is risk of fire.
