How to Change a Fuel Filter on a 1985 Cadillac DeVille

The older your car is, the more important the fuel filter is in the system. That's because with age, corrosion can be introduced into the gas tank, which will travel downstream to the fuel filter. Eventually, that filter will get clogged, choking the engine and hampering performance. In this case, the project vehicle is a 1985 Cadillac Deville with the 4.1L V8 engine, but the process is similar for other vehicles as well.

Tools Used: Jack, Jack stands, Drain pan, 3/8-inch ratchet and socket set, Line wrench set, Replacement fuel filter

Change a Fuel Filter

Raise the vehicle using a jack and secure it on jack stands. Double-check that the vehicle is secure prior to crawling underneath it. Open the gas door and remove the gas cap. Locate the fuel filter on the chassis. It will be either near the rear right wheel on the frame, or on the lower passenger side of the engine compartment. Place the drain pan underneath the filter.

Remove the fuel lines from the filter using the line wrench set and allow the fuel to drain into the drain pan. Unbolt the filter from the frame using the 3/8-inch ratchet and socket. Install the replacement filter in the bracket, making sure the arrow on the filter points away from the tank and toward the motor.

Connect the fuel lines to the replacement fuel filter using the line wrench, then reinstall the gas cap and lower the vehicle off of the jack stands using the jack.

Start the car. Check for leaks underneath the vehicle. If you find any, tighten up the leaking fittings using a line wrench.

Tips & Warnings

Never smoke or have an open flame nearby while you're working on the fuel system of a vehicle. If you do, you risk causing a fire.

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