The fuel filter in your 1989 Buick Regal Custom is accessible by raising the rear, passenger side wheel. General Motors fitted this filter with one of two types of fuelline connections. If your particular Custom model uses a line retaining nut at the filter, use a flare wrench to remove it--this will prevent you from stripping the retaining nut, and having to replace the whole line.
Tools Used: Wrench, Fuel pressure gauge J-34730-1 or equivalent, Container, Floor jack, Jack stand, Flare wrench, if necessary, Ratchet, Ratchet extension, Socket, 2 new O-rings, if necessary
Replace a Fuel Filter
Remove the Filter
Disconnect the negative (black) battery cable using a wrench.
Remove the fuel filler cap to relieve the pressure inside the fuel tank.
Connect fuel pressure gauge J-34730-1 or equivalent to the fuel pressure valve located on the fuel rail, and insert the gauge bleed hose into a suitable container.
Open the gauge valve. Let the fuel from the fuel rail drain into the container, then close the gauge valve.
Disconnect the pressure gauge from the pressure valve.
Raise the left (passenger side) wheel using a floor jack and support the vehicle at the frame with a jack stand.
Locate the fuel filter on the left frame rail near the fuel tank.
Wrap the fuel lines at the filter with a shop rag and disconnect the fuel lines from the filter using a backup wrench to hold the filter in place and a flare wrench to unscrew the line fitting. If your particular Regal model uses a quick-connect fitting, press the fitting tabs with your fingers and separate the line from the filter nipples.
Remove the O-rings from the line fittings, if your model is equipped with these gaskets.
Remove the fuel filter bracket from the frame rail, if necessary, using a ratchet, ratchet extension and socket.
Make a note of the filter orientation in its mounting bracket and remove the filter from the bracket.
Install the New Filter
Mount the new fuel filter in the bracket.
Install the filter and bracket on the frame rail, if you had to remove it. Use the ratchet, ratchet extension and socket.
Install new O-rings on the line fittings, if your model is equipped with these gaskets.
Connect the fuel lines to the filter using a backup wrench and flare wrench. If your Regal model uses quick-connect fittings, push the fittings against the filter nipples until they snap in place. Slightly pull at the fittings to make sure they have locked in place.
Lower your vehicle.
Tighten the fuel filler cap.
Connect the negative (black) battery cable using the wrench.
Start the engine and check for fuel leaks at the filter.
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