Park the 1998 Honda Odyssey in a safe area that is well ventilated such as outside or in your garage with the windows and doors open. Walk back to the rear of the Odyssey and remove the gas cap.
Open the hood and secure it in place. Look on the passenger side rear of the engine and locate the fuel filter. Use a flashlight if necessary. The fuel filter is a black canister with a top and bottom fuel line.
Slide the gas catch pan under the Odyssey directly below where the gas filter is located. Go back to the top of the engine and position a metric open-end wrench onto the bottom fuel line nut. Hold the gas filter with one hand and turn the bottom fuel line counterclockwise to loosen. Then, finish unscrewing the fuel line with your hand.
Position the metric open-end wrench onto the top fuel line. Hold the filter with one hand and turn the top fuel line nut counterclockwise to loosen. Finish unscrewing the fuel line with your hand.
Slide the gas filter out of the bracket and pull the gas filter out through the top of the engine. Discard the gas filter into the catch pan.
Position the new gas filter back through the top of the engine to the gas filter bracket. Screw the bottom fuel line nut back onto the gas filter and tighten down tight with the metric wrench.
Screw the top fuel line nut onto the gas filter. Then, tighten the top fuel line down tight with the metric wrench. Hold the gas filter with your free hand while tightening both fuel lines onto the gas filter.
Pull the pan out from under the car. Get in the car and turn the key on and off four times. This will fill the new filter up with gas and remove any air from the filter. Crank the engine on the fifth turn.
Get out of the car and inspect the new gas filter for any leaks. Close the hood and shut the engine off.